/[pcre]/code/trunk/pcre_exec.c

Diff of /code/trunk/pcre_exec.c

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-revision 567 by ph10,
Sat Nov  6 17:10:00 2010 UTC
+revision 743 by ph10,
Tue Nov  8 09:59:38 2011 UTC
 Line 6
  and semantics are as close as possible to those of the Perl 5 language.
                         Written by Philip Hazel
-            Copyright (c) 1997-2010 University of Cambridge
+            Copyright (c) 1997-2011 University of Cambridge
  -----------------------------------------------------------------------------
  Redistribution and use in source and binary forms, with or without
 Line 57 
 possible. There are also some static sup
  #undef min
  #undef max
- /* Flag bits for the match() function */
+ /* Values for setting in md->match_function_type to indicate two special types
+ of call to match(). We do it this way to save on using another stack variable,
+ as stack usage is to be discouraged. */
- #define match_condassert     0x01  /* Called to check a condition assertion */
+ #define MATCH_CONDASSERT     1  /* Called to check a condition assertion */
- #define match_cbegroup       0x02  /* Could-be-empty unlimited repeat group */
+ #define MATCH_CBEGROUP       2  /* Could-be-empty unlimited repeat group */
  /* Non-error returns from the match() function. Error returns are externally
  defined PCRE_ERROR_xxx codes, which are all negative. */
-Line 73 
 negative to avoid the external error cod
+Line 75 
 negative to avoid the external error cod
  #define MATCH_ACCEPT       (-999)
  #define MATCH_COMMIT       (-998)
- #define MATCH_PRUNE        (-997)
+ #define MATCH_KETRPOS      (-997)
- #define MATCH_SKIP         (-996)
+ #define MATCH_ONCE         (-996)
- #define MATCH_SKIP_ARG     (-995)
+ #define MATCH_PRUNE        (-995)
- #define MATCH_THEN         (-994)
+ #define MATCH_SKIP         (-994)
+ #define MATCH_SKIP_ARG     (-993)
+ #define MATCH_THEN         (-992)
  /* This is a convenience macro for code that occurs many times. */
-Line 132 
 while (length-- > 0)
+Line 136 
 while (length-- > 0)
  *          Match a back-reference                *
  *************************************************/
- /* If a back reference hasn't been set, the length that is passed is greater
+ /* Normally, if a back reference hasn't been set, the length that is passed is
- than the number of characters left in the string, so the match fails.
+ negative, so the match always fails. However, in JavaScript compatibility mode,
+ the length passed is zero. Note that in caseless UTF-8 mode, the number of
+ subject bytes matched may be different to the number of reference bytes.
  Arguments:
    offset      index into the offset vector
-   eptr        points into the subject
+   eptr        pointer into the subject
-   length      length to be matched
+   length      length of reference to be matched (number of bytes)
    md          points to match data block
-   ims         the ims flags
+   caseless    TRUE if caseless
- Returns:      TRUE if matched
+ Returns:      < 0 if not matched, otherwise the number of subject bytes matched
  */
- static BOOL
+ static int
  match_ref(int offset, register USPTR eptr, int length, match_data *md,
-   unsigned long int ims)
+   BOOL caseless)
  {
- USPTR p = md->start_subject + md->offset_vector[offset];
+ USPTR eptr_start = eptr;
+ register USPTR p = md->start_subject + md->offset_vector[offset];
  #ifdef PCRE_DEBUG
  if (eptr >= md->end_subject)
-Line 164 
 pchars(p, length, FALSE, md);
+Line 171 
 pchars(p, length, FALSE, md);
  printf("\n");
  #endif
- /* Always fail if not enough characters left */
+ /* Always fail if reference not set (and not JavaScript compatible). */
- if (length > md->end_subject - eptr) return FALSE;
+ if (length < 0) return -1;
  /* Separate the caseless case for speed. In UTF-8 mode we can only do this
  properly if Unicode properties are supported. Otherwise, we can check only
  ASCII characters. */
- if ((ims & PCRE_CASELESS) != 0)
+ if (caseless)
    {
  #ifdef SUPPORT_UTF8
  #ifdef SUPPORT_UCP
    if (md->utf8)
      {
-     USPTR endptr = eptr + length;
+     /* Match characters up to the end of the reference. NOTE: the number of
-     while (eptr < endptr)
+     bytes matched may differ, because there are some characters whose upper and
+     lower case versions code as different numbers of bytes. For example, U+023A
+     (2 bytes in UTF-8) is the upper case version of U+2C65 (3 bytes in UTF-8);
+     a sequence of 3 of the former uses 6 bytes, as does a sequence of two of
+     the latter. It is important, therefore, to check the length along the
+     reference, not along the subject (earlier code did this wrong). */
+     USPTR endptr = p + length;
+     while (p < endptr)
        {
        int c, d;
+       if (eptr >= md->end_subject) return -1;
        GETCHARINC(c, eptr);
        GETCHARINC(d, p);
-       if (c != d && c != UCD_OTHERCASE(d)) return FALSE;
+       if (c != d && c != UCD_OTHERCASE(d)) return -1;
        }
      }
    else
-Line 193 
 if ((ims & PCRE_CASELESS) != 0)
+Line 209 
 if ((ims & PCRE_CASELESS) != 0)
    /* The same code works when not in UTF-8 mode and in UTF-8 mode when there
    is no UCP support. */
+     {
-   while (length-- > 0)
+     if (eptr + length > md->end_subject) return -1;
-     { if (md->lcc[*p++] != md->lcc[*eptr++]) return FALSE; }
+     while (length-- > 0)
+       { if (md->lcc[*p++] != md->lcc[*eptr++]) return -1; }
+     }
    }
  /* In the caseful case, we can just compare the bytes, whether or not we
  are in UTF-8 mode. */
  else
-   { while (length-- > 0) if (*p++ != *eptr++) return FALSE; }
+   {
+   if (eptr + length > md->end_subject) return -1;
+   while (length-- > 0) if (*p++ != *eptr++) return -1;
+   }
- return TRUE;
+ return eptr - eptr_start;
  }
-Line 256 
 enum { RM1=1, RM2,  RM3,  RM4,  RM5,  RM
+Line 277 
 enum { RM1=1, RM2,  RM3,  RM4,  RM5,  RM
         RM31,  RM32, RM33, RM34, RM35, RM36, RM37, RM38, RM39, RM40,
         RM41,  RM42, RM43, RM44, RM45, RM46, RM47, RM48, RM49, RM50,
         RM51,  RM52, RM53, RM54, RM55, RM56, RM57, RM58, RM59, RM60,
-        RM61,  RM62 };
+        RM61,  RM62, RM63, RM64, RM65, RM66 };
  /* These versions of the macros use the stack, as normal. There are debugging
  versions and production versions. Note that the "rw" argument of RMATCH isn't
-Line 266 
 actually used in this definition. */
+Line 287 
 actually used in this definition. */
  #define REGISTER register
  #ifdef PCRE_DEBUG
- #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw) \
+ #define RMATCH(ra,rb,rc,rd,re,rw) \
    { \
    printf("match() called in line %d\n", __LINE__); \
-   rrc = match(ra,rb,mstart,markptr,rc,rd,re,rf,rg,rdepth+1); \
+   rrc = match(ra,rb,mstart,markptr,rc,rd,re,rdepth+1); \
    printf("to line %d\n", __LINE__); \
    }
  #define RRETURN(ra) \
-Line 278 
 actually used in this definition. */
+Line 299 
 actually used in this definition. */
    return ra; \
    }
  #else
- #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw) \
+ #define RMATCH(ra,rb,rc,rd,re,rw) \
-   rrc = match(ra,rb,mstart,markptr,rc,rd,re,rf,rg,rdepth+1)
+   rrc = match(ra,rb,mstart,markptr,rc,rd,re,rdepth+1)
  #define RRETURN(ra) return ra
  #endif
-Line 292 
 argument of match(), which never changes
+Line 313 
 argument of match(), which never changes
  #define REGISTER
- #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw)\
+ #define RMATCH(ra,rb,rc,rd,re,rw)\
    {\
    heapframe *newframe = (heapframe *)(pcre_stack_malloc)(sizeof(heapframe));\
    if (newframe == NULL) RRETURN(PCRE_ERROR_NOMEMORY);\
-Line 302 
 argument of match(), which never changes
+Line 323 
 argument of match(), which never changes
    newframe->Xmstart = mstart;\
    newframe->Xmarkptr = markptr;\
    newframe->Xoffset_top = rc;\
-   newframe->Xims = re;\
+   newframe->Xeptrb = re;\
-   newframe->Xeptrb = rf;\
-   newframe->Xflags = rg;\
    newframe->Xrdepth = frame->Xrdepth + 1;\
    newframe->Xprevframe = frame;\
    frame = newframe;\
-Line 340 
 typedef struct heapframe {
+Line 359 
 typedef struct heapframe {
    USPTR Xmstart;
    USPTR Xmarkptr;
    int Xoffset_top;
-   long int Xims;
    eptrblock *Xeptrb;
-   int Xflags;
    unsigned int Xrdepth;
    /* Function local variables */
-Line 363 
 typedef struct heapframe {
+Line 380 
 typedef struct heapframe {
    BOOL Xcondition;
    BOOL Xprev_is_word;
-   unsigned long int Xoriginal_ims;
  #ifdef SUPPORT_UCP
    int Xprop_type;
    int Xprop_value;
    int Xprop_fail_result;
-   int Xprop_category;
-   int Xprop_chartype;
-   int Xprop_script;
    int Xoclength;
    uschar Xocchars[8];
  #endif
-Line 450 
 Arguments:
+Line 462 
 Arguments:
     markptr     pointer to the most recent MARK name, or NULL
     offset_top  current top pointer
     md          pointer to "static" info for the match
-    ims         current /i, /m, and /s options
     eptrb       pointer to chain of blocks containing eptr at start of
                   brackets - for testing for empty matches
-    flags       can contain
-                  match_condassert - this is an assertion condition
-                  match_cbegroup - this is the start of an unlimited repeat
-                    group that can match an empty string
     rdepth      the recursion depth
  Returns:       MATCH_MATCH if matched            )  these values are >= 0
-Line 468 
 Returns:       MATCH_MATCH if matched
+Line 475 
 Returns:       MATCH_MATCH if matched
  static int
  match(REGISTER USPTR eptr, REGISTER const uschar *ecode, USPTR mstart,
-   const uschar *markptr, int offset_top, match_data *md, unsigned long int ims,
+   const uschar *markptr, int offset_top, match_data *md, eptrblock *eptrb,
-   eptrblock *eptrb, int flags, unsigned int rdepth)
+   unsigned int rdepth)
  {
  /* These variables do not need to be preserved over recursion in this function,
  so they can be ordinary variables in all cases. Mark some of them with
-Line 481 
 register unsigned int c;   /* Character
+Line 488 
 register unsigned int c;   /* Character
  register BOOL utf8;        /* Local copy of UTF-8 flag for speed */
  BOOL minimize, possessive; /* Quantifier options */
+ BOOL caseless;
  int condcode;
  /* When recursion is not being used, all "local" variables that have to be
-Line 500 
 frame->Xecode = ecode;
+Line 508 
 frame->Xecode = ecode;
  frame->Xmstart = mstart;
  frame->Xmarkptr = markptr;
  frame->Xoffset_top = offset_top;
- frame->Xims = ims;
  frame->Xeptrb = eptrb;
- frame->Xflags = flags;
  frame->Xrdepth = rdepth;
  /* This is where control jumps back to to effect "recursion" */
-Line 516 
 HEAP_RECURSE:
+Line 522 
 HEAP_RECURSE:
  #define mstart             frame->Xmstart
  #define markptr            frame->Xmarkptr
  #define offset_top         frame->Xoffset_top
- #define ims                frame->Xims
  #define eptrb              frame->Xeptrb
- #define flags              frame->Xflags
  #define rdepth             frame->Xrdepth
  /* Ditto for the local variables */
-Line 540 
 HEAP_RECURSE:
+Line 544 
 HEAP_RECURSE:
  #define condition          frame->Xcondition
  #define prev_is_word       frame->Xprev_is_word
- #define original_ims       frame->Xoriginal_ims
  #ifdef SUPPORT_UCP
  #define prop_type          frame->Xprop_type
  #define prop_value         frame->Xprop_value
  #define prop_fail_result   frame->Xprop_fail_result
- #define prop_category      frame->Xprop_category
- #define prop_chartype      frame->Xprop_chartype
- #define prop_script        frame->Xprop_script
  #define oclength           frame->Xoclength
  #define occhars            frame->Xocchars
  #endif
-Line 578 
 i, and fc and c, can be the same variabl
+Line 577 
 i, and fc and c, can be the same variabl
  #define fi i
  #define fc c
+ /* Many of the following variables are used only in small blocks of the code.
+ My normal style of coding would have declared them within each of those blocks.
+ However, in order to accommodate the version of this code that uses an external
+ "stack" implemented on the heap, it is easier to declare them all here, so the
+ declarations can be cut out in a block. The only declarations within blocks
+ below are for variables that do not have to be preserved over a recursive call
+ to RMATCH(). */
- #ifdef SUPPORT_UTF8                /* Many of these variables are used only  */
+ #ifdef SUPPORT_UTF8
- const uschar *charptr;             /* in small blocks of the code. My normal */
+ const uschar *charptr;
- #endif                             /* style of coding would have declared    */
+ #endif
- const uschar *callpat;             /* them within each of those blocks.      */
+ const uschar *callpat;
- const uschar *data;                /* However, in order to accommodate the   */
+ const uschar *data;
- const uschar *next;                /* version of this code that uses an      */
+ const uschar *next;
- USPTR         pp;                  /* external "stack" implemented on the    */
+ USPTR         pp;
- const uschar *prev;                /* heap, it is easier to declare them all */
+ const uschar *prev;
- USPTR         saved_eptr;          /* here, so the declarations can be cut   */
+ USPTR         saved_eptr;
-                                    /* out in a block. The only declarations  */
- recursion_info new_recursive;      /* within blocks below are for variables  */
+ recursion_info new_recursive;
-                                    /* that do not have to be preserved over  */
- BOOL cur_is_word;                  /* a recursive call to RMATCH().          */
+ BOOL cur_is_word;
  BOOL condition;
  BOOL prev_is_word;
- unsigned long int original_ims;
  #ifdef SUPPORT_UCP
  int prop_type;
  int prop_value;
  int prop_fail_result;
- int prop_category;
- int prop_chartype;
- int prop_script;
  int oclength;
  uschar occhars[8];
  #endif
-Line 623 
 int stacksave[REC_STACK_SAVE_MAX];
+Line 624 
 int stacksave[REC_STACK_SAVE_MAX];
  eptrblock newptrb;
  #endif     /* NO_RECURSE */
+ /* To save space on the stack and in the heap frame, I have doubled up on some
+ of the local variables that are used only in localised parts of the code, but
+ still need to be preserved over recursive calls of match(). These macros define
+ the alternative names that are used. */
+ #define allow_zero    cur_is_word
+ #define cbegroup      condition
+ #define code_offset   codelink
+ #define condassert    condition
+ #define matched_once  prev_is_word
  /* These statements are here to stop the compiler complaining about unitialized
  variables. */
-Line 659 
 haven't exceeded the recursive call limi
+Line 671 
 haven't exceeded the recursive call limi
  if (md->match_call_count++ >= md->match_limit) RRETURN(PCRE_ERROR_MATCHLIMIT);
  if (rdepth >= md->match_limit_recursion) RRETURN(PCRE_ERROR_RECURSIONLIMIT);
- original_ims = ims;    /* Save for resetting on ')' */
  /* At the start of a group with an unlimited repeat that may match an empty
- string, the match_cbegroup flag is set. When this is the case, add the current
+ string, the variable md->match_function_type is set to MATCH_CBEGROUP. It is
- subject pointer to the chain of such remembered pointers, to be checked when we
+ done this way to save having to use another function argument, which would take
- hit the closing ket, in order to break infinite loops that match no characters.
+ up space on the stack. See also MATCH_CONDASSERT below.
- When match() is called in other circumstances, don't add to the chain. The
- match_cbegroup flag must NOT be used with tail recursion, because the memory
+ When MATCH_CBEGROUP is set, add the current subject pointer to the chain of
- block that is used is on the stack, so a new one may be required for each
+ such remembered pointers, to be checked when we hit the closing ket, in order
- match(). */
+ to break infinite loops that match no characters. When match() is called in
+ other circumstances, don't add to the chain. The MATCH_CBEGROUP feature must
+ NOT be used with tail recursion, because the memory block that is used is on
+ the stack, so a new one may be required for each match(). */
- if ((flags & match_cbegroup) != 0)
+ if (md->match_function_type == MATCH_CBEGROUP)
    {
    newptrb.epb_saved_eptr = eptr;
    newptrb.epb_prev = eptrb;
    eptrb = &newptrb;
+   md->match_function_type = 0;
    }
  /* Now start processing the opcodes. */
-Line 689 
 for (;;)
+Line 703 
 for (;;)
      case OP_MARK:
      markptr = ecode + 2;
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1], offset_top, md,
-       ims, eptrb, flags, RM55);
+       eptrb, RM55);
      /* A return of MATCH_SKIP_ARG means that matching failed at SKIP with an
      argument, and we must check whether that argument matches this MARK's
-Line 715 
 for (;;)
+Line 729 
 for (;;)
      case OP_COMMIT:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
-       ims, eptrb, flags, RM52);
+       eptrb, RM52);
      if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE &&
          rrc != MATCH_SKIP && rrc != MATCH_SKIP_ARG &&
          rrc != MATCH_THEN)
-Line 726 
 for (;;)
+Line 740 
 for (;;)
      case OP_PRUNE:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
-       ims, eptrb, flags, RM51);
+       eptrb, RM51);
      if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
      MRRETURN(MATCH_PRUNE);
      case OP_PRUNE_ARG:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1], offset_top, md,
-       ims, eptrb, flags, RM56);
+       eptrb, RM56);
      if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
      md->mark = ecode + 2;
      RRETURN(MATCH_PRUNE);
-Line 741 
 for (;;)
+Line 755 
 for (;;)
      case OP_SKIP:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
-       ims, eptrb, flags, RM53);
+       eptrb, RM53);
      if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE && rrc != MATCH_THEN)
        RRETURN(rrc);
      md->start_match_ptr = eptr;   /* Pass back current position */
-Line 749 
 for (;;)
+Line 763 
 for (;;)
      case OP_SKIP_ARG:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1], offset_top, md,
-       ims, eptrb, flags, RM57);
+       eptrb, RM57);
      if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE && rrc != MATCH_THEN)
        RRETURN(rrc);
-Line 761 
 for (;;)
+Line 775 
 for (;;)
      md->start_match_ptr = ecode + 2;
      RRETURN(MATCH_SKIP_ARG);
-     /* For THEN (and THEN_ARG) we pass back the address of the bracket or
+     /* For THEN (and THEN_ARG) we pass back the address of the opcode, so that
-     the alt that is at the start of the current branch. This makes it possible
+     the branch in which it occurs can be determined. Overload the start of
-     to skip back past alternatives that precede the THEN within the current
+     match pointer to do this. */
-     branch. */
      case OP_THEN:
      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
-       ims, eptrb, flags, RM54);
+       eptrb, RM54);
      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
-     md->start_match_ptr = ecode - GET(ecode, 1);
+     md->start_match_ptr = ecode;
      MRRETURN(MATCH_THEN);
      case OP_THEN_ARG:
-     RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1+LINK_SIZE],
+     RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1], offset_top,
-       offset_top, md, ims, eptrb, flags, RM58);
+       md, eptrb, RM58);
      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
-     md->start_match_ptr = ecode - GET(ecode, 1);
+     md->start_match_ptr = ecode;
-     md->mark = ecode + LINK_SIZE + 2;
+     md->mark = ecode + 2;
      RRETURN(MATCH_THEN);
-     /* Handle a capturing bracket. If there is space in the offset vector, save
+     /* Handle an atomic group that does not contain any capturing parentheses.
-     the current subject position in the working slot at the top of the vector.
+     This can be handled like an assertion. Prior to 8.13, all atomic groups
-     We mustn't change the current values of the data slot, because they may be
+     were handled this way. In 8.13, the code was changed as below for ONCE, so
-     set from a previous iteration of this group, and be referred to by a
+     that backups pass through the group and thereby reset captured values.
-     reference inside the group.
+     However, this uses a lot more stack, so in 8.20, atomic groups that do not
+     contain any captures generate OP_ONCE_NC, which can be handled in the old,
-     If the bracket fails to match, we need to restore this value and also the
+     less stack intensive way.
-     values of the final offsets, in case they were set by a previous iteration
-     of the same bracket.
+     Check the alternative branches in turn - the matching won't pass the KET
+     for this kind of subpattern. If any one branch matches, we carry on as at
+     the end of a normal bracket, leaving the subject pointer, but resetting
+     the start-of-match value in case it was changed by \K. */
+     case OP_ONCE_NC:
+     prev = ecode;
+     saved_eptr = eptr;
+     do
+       {
+       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM64);
+       if (rrc == MATCH_MATCH)  /* Note: _not_ MATCH_ACCEPT */
+         {
+         mstart = md->start_match_ptr;
+         markptr = md->mark;
+         break;
+         }
+       if (rrc == MATCH_THEN)
+         {
+         next = ecode + GET(ecode,1);
+         if (md->start_match_ptr < next &&
+             (*ecode == OP_ALT || *next == OP_ALT))
+           rrc = MATCH_NOMATCH;
+         }
+       if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+       ecode += GET(ecode,1);
+       }
+     while (*ecode == OP_ALT);
+     /* If hit the end of the group (which could be repeated), fail */
+     if (*ecode != OP_ONCE_NC && *ecode != OP_ALT) RRETURN(MATCH_NOMATCH);
+     /* Continue as from after the group, updating the offsets high water
+     mark, since extracts may have been taken. */
+     do ecode += GET(ecode, 1); while (*ecode == OP_ALT);
+     offset_top = md->end_offset_top;
+     eptr = md->end_match_ptr;
+     /* For a non-repeating ket, just continue at this level. This also
+     happens for a repeating ket if no characters were matched in the group.
+     This is the forcible breaking of infinite loops as implemented in Perl
+.005. */
+     if (*ecode == OP_KET || eptr == saved_eptr)
+       {
+       ecode += 1+LINK_SIZE;
+       break;
+       }
+     /* The repeating kets try the rest of the pattern or restart from the
+     preceding bracket, in the appropriate order. The second "call" of match()
+     uses tail recursion, to avoid using another stack frame. */
+     if (*ecode == OP_KETRMIN)
+       {
+       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM65);
+       if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+       ecode = prev;
+       goto TAIL_RECURSE;
+       }
+     else  /* OP_KETRMAX */
+       {
+       md->match_function_type = MATCH_CBEGROUP;
+       RMATCH(eptr, prev, offset_top, md, eptrb, RM66);
+       if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+       ecode += 1 + LINK_SIZE;
+       goto TAIL_RECURSE;
+       }
+     /* Control never gets here */
+     /* Handle a capturing bracket, other than those that are possessive with an
+     unlimited repeat. If there is space in the offset vector, save the current
+     subject position in the working slot at the top of the vector. We mustn't
+     change the current values of the data slot, because they may be set from a
+     previous iteration of this group, and be referred to by a reference inside
+     the group. A failure to match might occur after the group has succeeded,
+     if something later on doesn't match. For this reason, we need to restore
+     the working value and also the values of the final offsets, in case they
+     were set by a previous iteration of the same bracket.
      If there isn't enough space in the offset vector, treat this as if it were
      a non-capturing bracket. Don't worry about setting the flag for the error
-Line 818 
 for (;;)
+Line 913 
 for (;;)
        md->offset_vector[md->offset_end - number] =
          (int)(eptr - md->start_subject);
-       flags = (op == OP_SCBRA)? match_cbegroup : 0;
+       for (;;)
-       do
          {
+         if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
          RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
-           ims, eptrb, flags, RM1);
+           eptrb, RM1);
-         if (rrc != MATCH_NOMATCH &&
+         if (rrc == MATCH_ONCE) break;  /* Backing up through an atomic group */
-             (rrc != MATCH_THEN || md->start_match_ptr != ecode))
-           RRETURN(rrc);
+         /* If we backed up to a THEN, check whether it is within the current
+         branch by comparing the address of the THEN that is passed back with
+         the end of the branch. If it is within the current branch, and the
+         branch is one of two or more alternatives (it either starts or ends
+         with OP_ALT), we have reached the limit of THEN's action, so convert
+         the return code to NOMATCH, which will cause normal backtracking to
+         happen from now on. Otherwise, THEN is passed back to an outer
+         alternative. This implements Perl's treatment of parenthesized groups,
+         where a group not containing | does not affect the current alternative,
+         that is, (X) is NOT the same as (X|(*F)). */
+         if (rrc == MATCH_THEN)
+           {
+           next = ecode + GET(ecode,1);
+           if (md->start_match_ptr < next &&
+               (*ecode == OP_ALT || *next == OP_ALT))
+             rrc = MATCH_NOMATCH;
+           }
+         /* Anything other than NOMATCH is passed back. */
+         if (rrc != MATCH_NOMATCH) RRETURN(rrc);
          md->capture_last = save_capture_last;
          ecode += GET(ecode, 1);
+         if (*ecode != OP_ALT) break;
          }
-       while (*ecode == OP_ALT);
        DPRINTF(("bracket %d failed\n", number));
        md->offset_vector[offset] = save_offset1;
        md->offset_vector[offset+1] = save_offset2;
        md->offset_vector[md->offset_end - number] = save_offset3;
-       if (rrc != MATCH_THEN) md->mark = markptr;
+       /* At this point, rrc will be one of MATCH_ONCE or MATCH_NOMATCH. */
-       RRETURN(MATCH_NOMATCH);
+       if (md->mark == NULL) md->mark = markptr;
+       RRETURN(rrc);
        }
      /* FALL THROUGH ... Insufficient room for saving captured contents. Treat
-Line 852 
 for (;;)
+Line 969 
 for (;;)
      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
-     /* Non-capturing bracket. Loop for all the alternatives. When we get to the
+     /* Non-capturing or atomic group, except for possessive with unlimited
-     final alternative within the brackets, we would return the result of a
+     repeat and ONCE group with no captures. Loop for all the alternatives.
-     recursive call to match() whatever happened. We can reduce stack usage by
-     turning this into a tail recursion, except in the case when match_cbegroup
-     is set.*/
+     When we get to the final alternative within the brackets, we used to return
+     the result of a recursive call to match() whatever happened so it was
+     possible to reduce stack usage by turning this into a tail recursion,
+     except in the case of a possibly empty group. However, now that there is
+     the possiblity of (*THEN) occurring in the final alternative, this
+     optimization is no longer always possible.
+     We can optimize if we know there are no (*THEN)s in the pattern; at present
+     this is the best that can be done.
+     MATCH_ONCE is returned when the end of an atomic group is successfully
+     reached, but subsequent matching fails. It passes back up the tree (causing
+     captured values to be reset) until the original atomic group level is
+     reached. This is tested by comparing md->once_target with the start of the
+     group. At this point, the return is converted into MATCH_NOMATCH so that
+     previous backup points can be taken. */
+     case OP_ONCE:
      case OP_BRA:
      case OP_SBRA:
      DPRINTF(("start non-capturing bracket\n"));
-     flags = (op >= OP_SBRA)? match_cbegroup : 0;
      for (;;)
        {
-       if (ecode[GET(ecode, 1)] != OP_ALT)   /* Final alternative */
+       if (op >= OP_SBRA || op == OP_ONCE) md->match_function_type = MATCH_CBEGROUP;
+       /* If this is not a possibly empty group, and there are no (*THEN)s in
+       the pattern, and this is the final alternative, optimize as described
+       above. */
+       else if (!md->hasthen && ecode[GET(ecode, 1)] != OP_ALT)
          {
-         if (flags == 0)    /* Not a possibly empty group */
+         ecode += _pcre_OP_lengths[*ecode];
+         goto TAIL_RECURSE;
+         }
+       /* In all other cases, we have to make another call to match(). */
+       RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md, eptrb,
+         RM2);
+       /* See comment in the code for capturing groups above about handling
+       THEN. */
+       if (rrc == MATCH_THEN)
+         {
+         next = ecode + GET(ecode,1);
+         if (md->start_match_ptr < next &&
+             (*ecode == OP_ALT || *next == OP_ALT))
+           rrc = MATCH_NOMATCH;
+         }
+       if (rrc != MATCH_NOMATCH)
+         {
+         if (rrc == MATCH_ONCE)
            {
-           ecode += _pcre_OP_lengths[*ecode];
+           const uschar *scode = ecode;
-           DPRINTF(("bracket 0 tail recursion\n"));
+           if (*scode != OP_ONCE)           /* If not at start, find it */
-           goto TAIL_RECURSE;
+             {
+             while (*scode == OP_ALT) scode += GET(scode, 1);
+             scode -= GET(scode, 1);
+             }
+           if (md->once_target == scode) rrc = MATCH_NOMATCH;
            }
+         RRETURN(rrc);
+         }
+       ecode += GET(ecode, 1);
+       if (*ecode != OP_ALT) break;
+       }
-         /* Possibly empty group; can't use tail recursion. */
+     if (md->mark == NULL) md->mark = markptr;
+     RRETURN(MATCH_NOMATCH);
-         RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md, ims,
+     /* Handle possessive capturing brackets with an unlimited repeat. We come
-           eptrb, flags, RM48);
+     here from BRAZERO with allow_zero set TRUE. The offset_vector values are
-         if (rrc == MATCH_NOMATCH) md->mark = markptr;
+     handled similarly to the normal case above. However, the matching is
-         RRETURN(rrc);
+     different. The end of these brackets will always be OP_KETRPOS, which
+     returns MATCH_KETRPOS without going further in the pattern. By this means
+     we can handle the group by iteration rather than recursion, thereby
+     reducing the amount of stack needed. */
+     case OP_CBRAPOS:
+     case OP_SCBRAPOS:
+     allow_zero = FALSE;
+     POSSESSIVE_CAPTURE:
+     number = GET2(ecode, 1+LINK_SIZE);
+     offset = number << 1;
+ #ifdef PCRE_DEBUG
+     printf("start possessive bracket %d\n", number);
+     printf("subject=");
+     pchars(eptr, 16, TRUE, md);
+     printf("\n");
+ #endif
+     if (offset < md->offset_max)
+       {
+       matched_once = FALSE;
+       code_offset = ecode - md->start_code;
+       save_offset1 = md->offset_vector[offset];
+       save_offset2 = md->offset_vector[offset+1];
+       save_offset3 = md->offset_vector[md->offset_end - number];
+       save_capture_last = md->capture_last;
+       DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3));
+       /* Each time round the loop, save the current subject position for use
+       when the group matches. For MATCH_MATCH, the group has matched, so we
+       restart it with a new subject starting position, remembering that we had
+       at least one match. For MATCH_NOMATCH, carry on with the alternatives, as
+       usual. If we haven't matched any alternatives in any iteration, check to
+       see if a previous iteration matched. If so, the group has matched;
+       continue from afterwards. Otherwise it has failed; restore the previous
+       capture values before returning NOMATCH. */
+       for (;;)
+         {
+         md->offset_vector[md->offset_end - number] =
+           (int)(eptr - md->start_subject);
+         if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
+         RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
+           eptrb, RM63);
+         if (rrc == MATCH_KETRPOS)
+           {
+           offset_top = md->end_offset_top;
+           eptr = md->end_match_ptr;
+           ecode = md->start_code + code_offset;
+           save_capture_last = md->capture_last;
+           matched_once = TRUE;
+           continue;
+           }
+         /* See comment in the code for capturing groups above about handling
+         THEN. */
+         if (rrc == MATCH_THEN)
+           {
+           next = ecode + GET(ecode,1);
+           if (md->start_match_ptr < next &&
+               (*ecode == OP_ALT || *next == OP_ALT))
+             rrc = MATCH_NOMATCH;
+           }
+         if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+         md->capture_last = save_capture_last;
+         ecode += GET(ecode, 1);
+         if (*ecode != OP_ALT) break;
          }
-       /* For non-final alternatives, continue the loop for a NOMATCH result;
+       if (!matched_once)
-       otherwise return. */
+         {
+         md->offset_vector[offset] = save_offset1;
+         md->offset_vector[offset+1] = save_offset2;
+         md->offset_vector[md->offset_end - number] = save_offset3;
+         }
-       RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md, ims,
+       if (md->mark == NULL) md->mark = markptr;
-         eptrb, flags, RM2);
+       if (allow_zero || matched_once)
-       if (rrc != MATCH_NOMATCH &&
+         {
-           (rrc != MATCH_THEN || md->start_match_ptr != ecode))
+         ecode += 1 + LINK_SIZE;
-         RRETURN(rrc);
+         break;
+         }
+       RRETURN(MATCH_NOMATCH);
+       }
+     /* FALL THROUGH ... Insufficient room for saving captured contents. Treat
+     as a non-capturing bracket. */
+     /* VVVVVVVVVVVVVVVVVVVVVVVVV */
+     /* VVVVVVVVVVVVVVVVVVVVVVVVV */
+     DPRINTF(("insufficient capture room: treat as non-capturing\n"));
+     /* VVVVVVVVVVVVVVVVVVVVVVVVV */
+     /* VVVVVVVVVVVVVVVVVVVVVVVVV */
+     /* Non-capturing possessive bracket with unlimited repeat. We come here
+     from BRAZERO with allow_zero = TRUE. The code is similar to the above,
+     without the capturing complication. It is written out separately for speed
+     and cleanliness. */
+     case OP_BRAPOS:
+     case OP_SBRAPOS:
+     allow_zero = FALSE;
+     POSSESSIVE_NON_CAPTURE:
+     matched_once = FALSE;
+     code_offset = ecode - md->start_code;
+     for (;;)
+       {
+       if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
+       RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,
+         eptrb, RM48);
+       if (rrc == MATCH_KETRPOS)
+         {
+         offset_top = md->end_offset_top;
+         eptr = md->end_match_ptr;
+         ecode = md->start_code + code_offset;
+         matched_once = TRUE;
+         continue;
+         }
+       /* See comment in the code for capturing groups above about handling
+       THEN. */
+       if (rrc == MATCH_THEN)
+         {
+         next = ecode + GET(ecode,1);
+         if (md->start_match_ptr < next &&
+             (*ecode == OP_ALT || *next == OP_ALT))
+           rrc = MATCH_NOMATCH;
+         }
+       if (rrc != MATCH_NOMATCH) RRETURN(rrc);
        ecode += GET(ecode, 1);
+       if (*ecode != OP_ALT) break;
        }
+     if (matched_once || allow_zero)
+       {
+       ecode += 1 + LINK_SIZE;
+       break;
+       }
+     RRETURN(MATCH_NOMATCH);
      /* Control never reaches here. */
      /* Conditional group: compilation checked that there are no more than
      two branches. If the condition is false, skipping the first branch takes us
      past the end if there is only one branch, but that's OK because that is
-     exactly what going to the ket would do. As there is only one branch to be
+     exactly what going to the ket would do. */
-     obeyed, we can use tail recursion to avoid using another stack frame. */
      case OP_COND:
      case OP_SCOND:
-     codelink= GET(ecode, 1);
+     codelink = GET(ecode, 1);
      /* Because of the way auto-callout works during compile, a callout item is
      inserted between OP_COND and an assertion condition. */
-Line 911 
 for (;;)
+Line 1220 
 for (;;)
        if (pcre_callout != NULL)
          {
          pcre_callout_block cb;
-         cb.version          = 1;   /* Version 1 of the callout block */
+         cb.version          = 2;   /* Version 1 of the callout block */
          cb.callout_number   = ecode[LINK_SIZE+2];
          cb.offset_vector    = md->offset_vector;
          cb.subject          = (PCRE_SPTR)md->start_subject;
-Line 923 
 for (;;)
+Line 1232 
 for (;;)
          cb.capture_top      = offset_top/2;
          cb.capture_last     = md->capture_last;
          cb.callout_data     = md->callout_data;
+         cb.mark             = markptr;
          if ((rrc = (*pcre_callout)(&cb)) > 0) MRRETURN(MATCH_NOMATCH);
          if (rrc < 0) RRETURN(rrc);
          }
-Line 1076 
 for (;;)
+Line 1386 
 for (;;)
        }
      /* The condition is an assertion. Call match() to evaluate it - setting
-     the final argument match_condassert causes it to stop at the end of an
+     md->match_function_type to MATCH_CONDASSERT causes it to stop at the end of
-     assertion. */
+     an assertion. */
      else
        {
-       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL,
+       md->match_function_type = MATCH_CONDASSERT;
-           match_condassert, RM3);
+       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM3);
        if (rrc == MATCH_MATCH)
          {
+         if (md->end_offset_top > offset_top)
+           offset_top = md->end_offset_top;  /* Captures may have happened */
          condition = TRUE;
          ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE + 2);
          while (*ecode == OP_ALT) ecode += GET(ecode, 1);
          }
-       else if (rrc != MATCH_NOMATCH &&
-               (rrc != MATCH_THEN || md->start_match_ptr != ecode))
+       /* PCRE doesn't allow the effect of (*THEN) to escape beyond an
+       assertion; it is therefore treated as NOMATCH. */
+       else if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN)
          {
          RRETURN(rrc);         /* Need braces because of following else */
          }
-Line 1101 
 for (;;)
+Line 1416 
 for (;;)
          }
        }
-     /* We are now at the branch that is to be obeyed. As there is only one,
+     /* We are now at the branch that is to be obeyed. As there is only one, can
-     we can use tail recursion to avoid using another stack frame, except when
+     use tail recursion to avoid using another stack frame, except when there is
-     match_cbegroup is required for an unlimited repeat of a possibly empty
+     unlimited repeat of a possibly empty group. In the latter case, a recursive
-     group. If the second alternative doesn't exist, we can just plough on. */
+     call to match() is always required, unless the second alternative doesn't
+     exist, in which case we can just plough on. Note that, for compatibility
+     with Perl, the | in a conditional group is NOT treated as creating two
+     alternatives. If a THEN is encountered in the branch, it propagates out to
+     the enclosing alternative (unless nested in a deeper set of alternatives,
+     of course). */
      if (condition || *ecode == OP_ALT)
        {
-       ecode += 1 + LINK_SIZE;
+       if (op != OP_SCOND)
-       if (op == OP_SCOND)        /* Possibly empty group */
          {
-         RMATCH(eptr, ecode, offset_top, md, ims, eptrb, match_cbegroup, RM49);
+         ecode += 1 + LINK_SIZE;
-         RRETURN(rrc);
-         }
-       else                       /* Group must match something */
-         {
-         flags = 0;
          goto TAIL_RECURSE;
          }
+       md->match_function_type = MATCH_CBEGROUP;
+       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM49);
+       RRETURN(rrc);
        }
-     else                         /* Condition false & no alternative */
+      /* Condition false & no alternative; continue after the group. */
+     else
        {
        ecode += 1 + LINK_SIZE;
        }
-Line 1151 
 for (;;)
+Line 1472 
 for (;;)
      break;
-     /* End of the pattern, either real or forced. If we are in a top-level
+     /* End of the pattern, either real or forced. */
-     recursion, we should restore the offsets appropriately and continue from
-     after the call. */
-     case OP_ACCEPT:
      case OP_END:
-     if (md->recursive != NULL && md->recursive->group_num == 0)
+     case OP_ACCEPT:
-       {
+     case OP_ASSERT_ACCEPT:
-       recursion_info *rec = md->recursive;
-       DPRINTF(("End of pattern in a (?0) recursion\n"));
-       md->recursive = rec->prevrec;
-       memmove(md->offset_vector, rec->offset_save,
-         rec->saved_max * sizeof(int));
-       offset_top = rec->save_offset_top;
-       ims = original_ims;
-       ecode = rec->after_call;
-       break;
-       }
-     /* Otherwise, if we have matched an empty string, fail if PCRE_NOTEMPTY is
+     /* If we have matched an empty string, fail if not in an assertion and not
-     set, or if PCRE_NOTEMPTY_ATSTART is set and we have matched at the start of
+     in a recursion if either PCRE_NOTEMPTY is set, or if PCRE_NOTEMPTY_ATSTART
-     the subject. In both cases, backtracking will then try other alternatives,
+     is set and we have matched at the start of the subject. In both cases,
-     if any. */
+     backtracking will then try other alternatives, if any. */
-     if (eptr == mstart &&
+     if (eptr == mstart && op != OP_ASSERT_ACCEPT &&
-         (md->notempty ||
+          md->recursive == NULL &&
-           (md->notempty_atstart &&
+          (md->notempty ||
-             mstart == md->start_subject + md->start_offset)))
+            (md->notempty_atstart &&
+              mstart == md->start_subject + md->start_offset)))
        MRRETURN(MATCH_NOMATCH);
      /* Otherwise, we have a match. */
-Line 1193 
 for (;;)
+Line 1502 
 for (;;)
      rrc = (op == OP_END)? MATCH_MATCH : MATCH_ACCEPT;
      MRRETURN(rrc);
-     /* Change option settings */
-     case OP_OPT:
-     ims = ecode[1];
-     ecode += 2;
-     DPRINTF(("ims set to %02lx\n", ims));
-     break;
      /* Assertion brackets. Check the alternative branches in turn - the
      matching won't pass the KET for an assertion. If any one branch matches,
      the assertion is true. Lookbehind assertions have an OP_REVERSE item at the
      start of each branch to move the current point backwards, so the code at
-     this level is identical to the lookahead case. */
+     this level is identical to the lookahead case. When the assertion is part
+     of a condition, we want to return immediately afterwards. The caller of
+     this incarnation of the match() function will have set MATCH_CONDASSERT in
+     md->match_function type, and one of these opcodes will be the first opcode
+     that is processed. We use a local variable that is preserved over calls to
+     match() to remember this case. */
      case OP_ASSERT:
      case OP_ASSERTBACK:
+     if (md->match_function_type == MATCH_CONDASSERT)
+       {
+       condassert = TRUE;
+       md->match_function_type = 0;
+       }
+     else condassert = FALSE;
      do
        {
-       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, 0,
+       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM4);
-         RM4);
        if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT)
          {
          mstart = md->start_match_ptr;   /* In case \K reset it */
+         markptr = md->mark;
          break;
          }
-       if (rrc != MATCH_NOMATCH &&
-           (rrc != MATCH_THEN || md->start_match_ptr != ecode))
+       /* PCRE does not allow THEN to escape beyond an assertion; it is treated
-         RRETURN(rrc);
+       as NOMATCH. */
+       if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
        ecode += GET(ecode, 1);
        }
      while (*ecode == OP_ALT);
      if (*ecode == OP_KET) MRRETURN(MATCH_NOMATCH);
      /* If checking an assertion for a condition, return MATCH_MATCH. */
-     if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH);
+     if (condassert) RRETURN(MATCH_MATCH);
      /* Continue from after the assertion, updating the offsets high water
      mark, since extracts may have been taken during the assertion. */
-Line 1244 
 for (;;)
+Line 1560 
 for (;;)
      case OP_ASSERT_NOT:
      case OP_ASSERTBACK_NOT:
+     if (md->match_function_type == MATCH_CONDASSERT)
+       {
+       condassert = TRUE;
+       md->match_function_type = 0;
+       }
+     else condassert = FALSE;
      do
        {
-       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, 0,
+       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM5);
-         RM5);
        if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT) MRRETURN(MATCH_NOMATCH);
        if (rrc == MATCH_SKIP || rrc == MATCH_PRUNE || rrc == MATCH_COMMIT)
          {
          do ecode += GET(ecode,1); while (*ecode == OP_ALT);
          break;
          }
-       if (rrc != MATCH_NOMATCH &&
-           (rrc != MATCH_THEN || md->start_match_ptr != ecode))
+       /* PCRE does not allow THEN to escape beyond an assertion; it is treated
-         RRETURN(rrc);
+       as NOMATCH. */
+       if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
        ecode += GET(ecode,1);
        }
      while (*ecode == OP_ALT);
-     if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH);
+     if (condassert) RRETURN(MATCH_MATCH);  /* Condition assertion */
      ecode += 1 + LINK_SIZE;
      continue;
-Line 1307 
 for (;;)
+Line 1631 
 for (;;)
      if (pcre_callout != NULL)
        {
        pcre_callout_block cb;
-       cb.version          = 1;   /* Version 1 of the callout block */
+       cb.version          = 2;   /* Version 1 of the callout block */
        cb.callout_number   = ecode[1];
        cb.offset_vector    = md->offset_vector;
        cb.subject          = (PCRE_SPTR)md->start_subject;
-Line 1319 
 for (;;)
+Line 1643 
 for (;;)
        cb.capture_top      = offset_top/2;
        cb.capture_last     = md->capture_last;
        cb.callout_data     = md->callout_data;
+       cb.mark             = markptr;
        if ((rrc = (*pcre_callout)(&cb)) > 0) MRRETURN(MATCH_NOMATCH);
        if (rrc < 0) RRETURN(rrc);
        }
-Line 1329 
 for (;;)
+Line 1654 
 for (;;)
      offset data is the offset to the starting bracket from the start of the
      whole pattern. (This is so that it works from duplicated subpatterns.)
-     If there are any capturing brackets started but not finished, we have to
+     The state of the capturing groups is preserved over recursion, and
-     save their starting points and reinstate them after the recursion. However,
+     re-instated afterwards. We don't know how many are started and not yet
-     we don't know how many such there are (offset_top records the completed
+     finished (offset_top records the completed total) so we just have to save
-     total) so we just have to save all the potential data. There may be up to
+     all the potential data. There may be up to 65535 such values, which is too
-such values, which is too large to put on the stack, but using malloc
+     large to put on the stack, but using malloc for small numbers seems
-     for small numbers seems expensive. As a compromise, the stack is used when
+     expensive. As a compromise, the stack is used when there are no more than
-     there are no more than REC_STACK_SAVE_MAX values to store; otherwise malloc
+     REC_STACK_SAVE_MAX values to store; otherwise malloc is used.
-     is used. A problem is what to do if the malloc fails ... there is no way of
-     returning to the top level with an error. Save the top REC_STACK_SAVE_MAX
-     values on the stack, and accept that the rest may be wrong.
      There are also other values that have to be saved. We use a chained
      sequence of blocks that actually live on the stack. Thanks to Robin Houston
-     for the original version of this logic. */
+     for the original version of this logic. It has, however, been hacked around
+     a lot, so he is not to blame for the current way it works. */
      case OP_RECURSE:
        {
+       recursion_info *ri;
+       int recno;
        callpat = md->start_code + GET(ecode, 1);
-       new_recursive.group_num = (callpat == md->start_code)? 0 :
+       recno = (callpat == md->start_code)? 0 :
          GET2(callpat, 1 + LINK_SIZE);
+       /* Check for repeating a recursion without advancing the subject pointer.
+       This should catch convoluted mutual recursions. (Some simple cases are
+       caught at compile time.) */
+       for (ri = md->recursive; ri != NULL; ri = ri->prevrec)
+         if (recno == ri->group_num && eptr == ri->subject_position)
+           RRETURN(PCRE_ERROR_RECURSELOOP);
        /* Add to "recursing stack" */
+       new_recursive.group_num = recno;
+       new_recursive.subject_position = eptr;
        new_recursive.prevrec = md->recursive;
        md->recursive = &new_recursive;
-       /* Find where to continue from afterwards */
+       /* Where to continue from afterwards */
        ecode += 1 + LINK_SIZE;
-       new_recursive.after_call = ecode;
-       /* Now save the offset data. */
+       /* Now save the offset data */
        new_recursive.saved_max = md->offset_end;
        if (new_recursive.saved_max <= REC_STACK_SAVE_MAX)
-Line 1371 
 for (;;)
+Line 1706 
 for (;;)
            (int *)(pcre_malloc)(new_recursive.saved_max * sizeof(int));
          if (new_recursive.offset_save == NULL) RRETURN(PCRE_ERROR_NOMEMORY);
          }
        memcpy(new_recursive.offset_save, md->offset_vector,
              new_recursive.saved_max * sizeof(int));
-       new_recursive.save_offset_top = offset_top;
-       /* OK, now we can do the recursion. For each top-level alternative we
+       /* OK, now we can do the recursion. After processing each alternative,
-       restore the offset and recursion data. */
+       restore the offset data. If there were nested recursions, md->recursive
+       might be changed, so reset it before looping. */
        DPRINTF(("Recursing into group %d\n", new_recursive.group_num));
-       flags = (*callpat >= OP_SBRA)? match_cbegroup : 0;
+       cbegroup = (*callpat >= OP_SBRA);
        do
          {
+         if (cbegroup) md->match_function_type = MATCH_CBEGROUP;
          RMATCH(eptr, callpat + _pcre_OP_lengths[*callpat], offset_top,
-           md, ims, eptrb, flags, RM6);
+           md, eptrb, RM6);
+         memcpy(md->offset_vector, new_recursive.offset_save,
+             new_recursive.saved_max * sizeof(int));
+         md->recursive = new_recursive.prevrec;
          if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT)
            {
            DPRINTF(("Recursion matched\n"));
-           md->recursive = new_recursive.prevrec;
            if (new_recursive.offset_save != stacksave)
              (pcre_free)(new_recursive.offset_save);
-           MRRETURN(MATCH_MATCH);
+           /* Set where we got to in the subject, and reset the start in case
+           it was changed by \K. This *is* propagated back out of a recursion,
+           for Perl compatibility. */
+           eptr = md->end_match_ptr;
+           mstart = md->start_match_ptr;
+           goto RECURSION_MATCHED;        /* Exit loop; end processing */
            }
-         else if (rrc != MATCH_NOMATCH &&
-                 (rrc != MATCH_THEN || md->start_match_ptr != ecode))
+         /* PCRE does not allow THEN to escape beyond a recursion; it is treated
+         as NOMATCH. */
+         else if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN)
            {
            DPRINTF(("Recursion gave error %d\n", rrc));
            if (new_recursive.offset_save != stacksave)
-Line 1403 
 for (;;)
+Line 1750 
 for (;;)
            }
          md->recursive = &new_recursive;
-         memcpy(md->offset_vector, new_recursive.offset_save,
-             new_recursive.saved_max * sizeof(int));
          callpat += GET(callpat, 1);
          }
        while (*callpat == OP_ALT);
        DPRINTF(("Recursion didn't match\n"));
        md->recursive = new_recursive.prevrec;
        if (new_recursive.offset_save != stacksave)
          (pcre_free)(new_recursive.offset_save);
        MRRETURN(MATCH_NOMATCH);
-       }
-     /* Control never reaches here */
-     /* "Once" brackets are like assertion brackets except that after a match,
-     the point in the subject string is not moved back. Thus there can never be
-     a move back into the brackets. Friedl calls these "atomic" subpatterns.
-     Check the alternative branches in turn - the matching won't pass the KET
-     for this kind of subpattern. If any one branch matches, we carry on as at
-     the end of a normal bracket, leaving the subject pointer, but resetting
-     the start-of-match value in case it was changed by \K. */
-     case OP_ONCE:
-     prev = ecode;
-     saved_eptr = eptr;
-     do
-       {
-       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM7);
-       if (rrc == MATCH_MATCH)  /* Note: _not_ MATCH_ACCEPT */
-         {
-         mstart = md->start_match_ptr;
-         break;
-         }
-       if (rrc != MATCH_NOMATCH &&
-           (rrc != MATCH_THEN || md->start_match_ptr != ecode))
-         RRETURN(rrc);
-       ecode += GET(ecode,1);
-       }
-     while (*ecode == OP_ALT);
-     /* If hit the end of the group (which could be repeated), fail */
-     if (*ecode != OP_ONCE && *ecode != OP_ALT) RRETURN(MATCH_NOMATCH);
-     /* Continue as from after the assertion, updating the offsets high water
-     mark, since extracts may have been taken. */
-     do ecode += GET(ecode, 1); while (*ecode == OP_ALT);
-     offset_top = md->end_offset_top;
-     eptr = md->end_match_ptr;
-     /* For a non-repeating ket, just continue at this level. This also
-     happens for a repeating ket if no characters were matched in the group.
-     This is the forcible breaking of infinite loops as implemented in Perl
-.005. If there is an options reset, it will get obeyed in the normal
-     course of events. */
-     if (*ecode == OP_KET || eptr == saved_eptr)
-       {
-       ecode += 1+LINK_SIZE;
-       break;
-       }
-     /* The repeating kets try the rest of the pattern or restart from the
-     preceding bracket, in the appropriate order. The second "call" of match()
-     uses tail recursion, to avoid using another stack frame. We need to reset
-     any options that changed within the bracket before re-running it, so
-     check the next opcode. */
-     if (ecode[1+LINK_SIZE] == OP_OPT)
-       {
-       ims = (ims & ~PCRE_IMS) | ecode[4];
-       DPRINTF(("ims set to %02lx at group repeat\n", ims));
        }
-     if (*ecode == OP_KETRMIN)
+     RECURSION_MATCHED:
-       {
+     break;
-       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM8);
-       if (rrc != MATCH_NOMATCH) RRETURN(rrc);
-       ecode = prev;
-       flags = 0;
-       goto TAIL_RECURSE;
-       }
-     else  /* OP_KETRMAX */
-       {
-       RMATCH(eptr, prev, offset_top, md, ims, eptrb, match_cbegroup, RM9);
-       if (rrc != MATCH_NOMATCH) RRETURN(rrc);
-       ecode += 1 + LINK_SIZE;
-       flags = 0;
-       goto TAIL_RECURSE;
-       }
-     /* Control never gets here */
      /* An alternation is the end of a branch; scan along to find the end of the
      bracketed group and go to there. */
-Line 1512 
 for (;;)
+Line 1778 
 for (;;)
      optional ones preceded by BRAZERO or BRAMINZERO. */
      case OP_BRAZERO:
-       {
+     next = ecode + 1;
-       next = ecode+1;
+     RMATCH(eptr, next, offset_top, md, eptrb, RM10);
-       RMATCH(eptr, next, offset_top, md, ims, eptrb, 0, RM10);
+     if (rrc != MATCH_NOMATCH) RRETURN(rrc);
-       if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+     do next += GET(next, 1); while (*next == OP_ALT);
-       do next += GET(next,1); while (*next == OP_ALT);
+     ecode = next + 1 + LINK_SIZE;
-       ecode = next + 1 + LINK_SIZE;
-       }
      break;
      case OP_BRAMINZERO:
-       {
+     next = ecode + 1;
-       next = ecode+1;
+     do next += GET(next, 1); while (*next == OP_ALT);
-       do next += GET(next, 1); while (*next == OP_ALT);
+     RMATCH(eptr, next + 1+LINK_SIZE, offset_top, md, eptrb, RM11);
-       RMATCH(eptr, next + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0, RM11);
+     if (rrc != MATCH_NOMATCH) RRETURN(rrc);
-       if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+     ecode++;
-       ecode++;
-       }
      break;
      case OP_SKIPZERO:
-       {
+     next = ecode+1;
-       next = ecode+1;
+     do next += GET(next,1); while (*next == OP_ALT);
-       do next += GET(next,1); while (*next == OP_ALT);
+     ecode = next + 1 + LINK_SIZE;
-       ecode = next + 1 + LINK_SIZE;
-       }
      break;
+     /* BRAPOSZERO occurs before a possessive bracket group. Don't do anything
+     here; just jump to the group, with allow_zero set TRUE. */
+     case OP_BRAPOSZERO:
+     op = *(++ecode);
+     allow_zero = TRUE;
+     if (op == OP_CBRAPOS || op == OP_SCBRAPOS) goto POSSESSIVE_CAPTURE;
+       goto POSSESSIVE_NON_CAPTURE;
      /* End of a group, repeated or non-repeating. */
      case OP_KET:
      case OP_KETRMIN:
      case OP_KETRMAX:
+     case OP_KETRPOS:
      prev = ecode - GET(ecode, 1);
      /* If this was a group that remembered the subject start, in order to break
      infinite repeats of empty string matches, retrieve the subject start from
      the chain. Otherwise, set it NULL. */
-     if (*prev >= OP_SBRA)
+     if (*prev >= OP_SBRA || *prev == OP_ONCE)
        {
        saved_eptr = eptrb->epb_saved_eptr;   /* Value at start of group */
        eptrb = eptrb->epb_prev;              /* Backup to previous group */
        }
      else saved_eptr = NULL;
-     /* If we are at the end of an assertion group or an atomic group, stop
+     /* If we are at the end of an assertion group or a non-capturing atomic
-     matching and return MATCH_MATCH, but record the current high water mark for
+     group, stop matching and return MATCH_MATCH, but record the current high
-     use by positive assertions. We also need to record the match start in case
+     water mark for use by positive assertions. We also need to record the match
-     it was changed by \K. */
+     start in case it was changed by \K. */
-     if (*prev == OP_ASSERT || *prev == OP_ASSERT_NOT ||
+     if ((*prev >= OP_ASSERT && *prev <= OP_ASSERTBACK_NOT) ||
-         *prev == OP_ASSERTBACK || *prev == OP_ASSERTBACK_NOT ||
+          *prev == OP_ONCE_NC)
-         *prev == OP_ONCE)
        {
-       md->end_match_ptr = eptr;      /* For ONCE */
+       md->end_match_ptr = eptr;      /* For ONCE_NC */
        md->end_offset_top = offset_top;
        md->start_match_ptr = mstart;
-       MRRETURN(MATCH_MATCH);
+       MRRETURN(MATCH_MATCH);         /* Sets md->mark */
        }
      /* For capturing groups we have to check the group number back at the start
      and if necessary complete handling an extraction by setting the offsets and
-     bumping the high water mark. Note that whole-pattern recursion is coded as
+     bumping the high water mark. Whole-pattern recursion is coded as a recurse
-     a recurse into group 0, so it won't be picked up here. Instead, we catch it
+     into group 0, so it won't be picked up here. Instead, we catch it when the
-     when the OP_END is reached. Other recursion is handled here. */
+     OP_END is reached. Other recursion is handled here. We just have to record
+     the current subject position and start match pointer and give a MATCH
+     return. */
-     if (*prev == OP_CBRA || *prev == OP_SCBRA)
+     if (*prev == OP_CBRA || *prev == OP_SCBRA ||
+         *prev == OP_CBRAPOS || *prev == OP_SCBRAPOS)
        {
        number = GET2(prev, 1+LINK_SIZE);
        offset = number << 1;
-Line 1588 
 for (;;)
+Line 1860 
 for (;;)
        printf("\n");
  #endif
+       /* Handle a recursively called group. */
+       if (md->recursive != NULL && md->recursive->group_num == number)
+         {
+         md->end_match_ptr = eptr;
+         md->start_match_ptr = mstart;
+         RRETURN(MATCH_MATCH);
+         }
+       /* Deal with capturing */
        md->capture_last = number;
        if (offset >= md->offset_max) md->offset_overflow = TRUE; else
          {
+         /* If offset is greater than offset_top, it means that we are
+         "skipping" a capturing group, and that group's offsets must be marked
+         unset. In earlier versions of PCRE, all the offsets were unset at the
+         start of matching, but this doesn't work because atomic groups and
+         assertions can cause a value to be set that should later be unset.
+         Example: matching /(?>(a))b|(a)c/ against "ac". This sets group 1 as
+         part of the atomic group, but this is not on the final matching path,
+         so must be unset when 2 is set. (If there is no group 2, there is no
+         problem, because offset_top will then be 2, indicating no capture.) */
+         if (offset > offset_top)
+           {
+           register int *iptr = md->offset_vector + offset_top;
+           register int *iend = md->offset_vector + offset;
+           while (iptr < iend) *iptr++ = -1;
+           }
+         /* Now make the extraction */
          md->offset_vector[offset] =
            md->offset_vector[md->offset_end - number];
          md->offset_vector[offset+1] = (int)(eptr - md->start_subject);
          if (offset_top <= offset) offset_top = offset + 2;
          }
+       }
-       /* Handle a recursively called group. Restore the offsets
+     /* For an ordinary non-repeating ket, just continue at this level. This
-       appropriately and continue from after the call. */
+     also happens for a repeating ket if no characters were matched in the
+     group. This is the forcible breaking of infinite loops as implemented in
+     Perl 5.005. For a non-repeating atomic group that includes captures,
+     establish a backup point by processing the rest of the pattern at a lower
+     level. If this results in a NOMATCH return, pass MATCH_ONCE back to the
+     original OP_ONCE level, thereby bypassing intermediate backup points, but
+     resetting any captures that happened along the way. */
-       if (md->recursive != NULL && md->recursive->group_num == number)
+     if (*ecode == OP_KET || eptr == saved_eptr)
+       {
+       if (*prev == OP_ONCE)
          {
-         recursion_info *rec = md->recursive;
+         RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM12);
-         DPRINTF(("Recursion (%d) succeeded - continuing\n", number));
+         if (rrc != MATCH_NOMATCH) RRETURN(rrc);
-         md->recursive = rec->prevrec;
+         md->once_target = prev;  /* Level at which to change to MATCH_NOMATCH */
-         memcpy(md->offset_vector, rec->offset_save,
+         RRETURN(MATCH_ONCE);
-           rec->saved_max * sizeof(int));
-         offset_top = rec->save_offset_top;
-         ecode = rec->after_call;
-         ims = original_ims;
-         break;
          }
+       ecode += 1 + LINK_SIZE;    /* Carry on at this level */
+       break;
        }
-     /* For both capturing and non-capturing groups, reset the value of the ims
+     /* OP_KETRPOS is a possessive repeating ket. Remember the current position,
-     flags, in case they got changed during the group. */
+     and return the MATCH_KETRPOS. This makes it possible to do the repeats one
+     at a time from the outer level, thus saving stack. */
-     ims = original_ims;
+     if (*ecode == OP_KETRPOS)
-     DPRINTF(("ims reset to %02lx\n", ims));
-     /* For a non-repeating ket, just continue at this level. This also
-     happens for a repeating ket if no characters were matched in the group.
-     This is the forcible breaking of infinite loops as implemented in Perl
-.005. If there is an options reset, it will get obeyed in the normal
-     course of events. */
-     if (*ecode == OP_KET || eptr == saved_eptr)
        {
-       ecode += 1 + LINK_SIZE;
+       md->end_match_ptr = eptr;
-       break;
+       md->end_offset_top = offset_top;
+       RRETURN(MATCH_KETRPOS);
        }
-     /* The repeating kets try the rest of the pattern or restart from the
+     /* The normal repeating kets try the rest of the pattern or restart from
-     preceding bracket, in the appropriate order. In the second case, we can use
+     the preceding bracket, in the appropriate order. In the second case, we can
-     tail recursion to avoid using another stack frame, unless we have an
+     use tail recursion to avoid using another stack frame, unless we have an
-     unlimited repeat of a group that can match an empty string. */
+     an atomic group or an unlimited repeat of a group that can match an empty
+     string. */
-     flags = (*prev >= OP_SBRA)? match_cbegroup : 0;
      if (*ecode == OP_KETRMIN)
        {
-       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM12);
+       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM7);
        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
-       if (flags != 0)    /* Could match an empty string */
+       if (*prev == OP_ONCE)
+         {
+         RMATCH(eptr, prev, offset_top, md, eptrb, RM8);
+         if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+         md->once_target = prev;  /* Level at which to change to MATCH_NOMATCH */
+         RRETURN(MATCH_ONCE);
+         }
+       if (*prev >= OP_SBRA)    /* Could match an empty string */
          {
-         RMATCH(eptr, prev, offset_top, md, ims, eptrb, flags, RM50);
+         md->match_function_type = MATCH_CBEGROUP;
+         RMATCH(eptr, prev, offset_top, md, eptrb, RM50);
          RRETURN(rrc);
          }
        ecode = prev;
-Line 1653 
 for (;;)
+Line 1961 
 for (;;)
        }
      else  /* OP_KETRMAX */
        {
-       RMATCH(eptr, prev, offset_top, md, ims, eptrb, flags, RM13);
+       if (*prev >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
+       RMATCH(eptr, prev, offset_top, md, eptrb, RM13);
+       if (rrc == MATCH_ONCE && md->once_target == prev) rrc = MATCH_NOMATCH;
        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+       if (*prev == OP_ONCE)
+         {
+         RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM9);
+         if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+         md->once_target = prev;
+         RRETURN(MATCH_ONCE);
+         }
        ecode += 1 + LINK_SIZE;
-       flags = 0;
        goto TAIL_RECURSE;
        }
      /* Control never gets here */
-     /* Start of subject unless notbol, or after internal newline if multiline */
+     /* Not multiline mode: start of subject assertion, unless notbol. */
      case OP_CIRC:
      if (md->notbol && eptr == md->start_subject) MRRETURN(MATCH_NOMATCH);
-     if ((ims & PCRE_MULTILINE) != 0)
-       {
-       if (eptr != md->start_subject &&
-           (eptr == md->end_subject || !WAS_NEWLINE(eptr)))
-         MRRETURN(MATCH_NOMATCH);
-       ecode++;
-       break;
-       }
-     /* ... else fall through */
      /* Start of subject assertion */
-Line 1682 
 for (;;)
+Line 1989 
 for (;;)
      ecode++;
      break;
+     /* Multiline mode: start of subject unless notbol, or after any newline. */
+     case OP_CIRCM:
+     if (md->notbol && eptr == md->start_subject) MRRETURN(MATCH_NOMATCH);
+     if (eptr != md->start_subject &&
+         (eptr == md->end_subject || !WAS_NEWLINE(eptr)))
+       MRRETURN(MATCH_NOMATCH);
+     ecode++;
+     break;
      /* Start of match assertion */
      case OP_SOM:
-Line 1696 
 for (;;)
+Line 2013 
 for (;;)
      ecode++;
      break;
-     /* Assert before internal newline if multiline, or before a terminating
+     /* Multiline mode: assert before any newline, or before end of subject
-     newline unless endonly is set, else end of subject unless noteol is set. */
+     unless noteol is set. */
-     case OP_DOLL:
+     case OP_DOLLM:
-     if ((ims & PCRE_MULTILINE) != 0)
+     if (eptr < md->end_subject)
-       {
+       { if (!IS_NEWLINE(eptr)) MRRETURN(MATCH_NOMATCH); }
-       if (eptr < md->end_subject)
+     else
-         { if (!IS_NEWLINE(eptr)) MRRETURN(MATCH_NOMATCH); }
-       else
-         {
-         if (md->noteol) MRRETURN(MATCH_NOMATCH);
-         SCHECK_PARTIAL();
-         }
-       ecode++;
-       break;
-       }
-     else  /* Not multiline */
        {
        if (md->noteol) MRRETURN(MATCH_NOMATCH);
-       if (!md->endonly) goto ASSERT_NL_OR_EOS;
+       SCHECK_PARTIAL();
        }
+     ecode++;
+     break;
+     /* Not multiline mode: assert before a terminating newline or before end of
+     subject unless noteol is set. */
+     case OP_DOLL:
+     if (md->noteol) MRRETURN(MATCH_NOMATCH);
+     if (!md->endonly) goto ASSERT_NL_OR_EOS;
      /* ... else fall through for endonly */
      /* End of subject assertion (\z) */
-Line 1735 
 for (;;)
+Line 2051 
 for (;;)
      if (eptr < md->end_subject &&
          (!IS_NEWLINE(eptr) || eptr != md->end_subject - md->nllen))
        MRRETURN(MATCH_NOMATCH);
      /* Either at end of string or \n before end. */
      SCHECK_PARTIAL();
      ecode++;
      break;
-Line 1867 
 for (;;)
+Line 2183 
 for (;;)
      /* Fall through */
      case OP_ALLANY:
-     if (eptr++ >= md->end_subject)
+     if (eptr >= md->end_subject)   /* DO NOT merge the eptr++ here; it must */
-       {
+       {                            /* not be updated before SCHECK_PARTIAL. */
        SCHECK_PARTIAL();
        MRRETURN(MATCH_NOMATCH);
        }
+     eptr++;
      if (utf8) while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;
      ecode++;
      break;
-Line 1880 
 for (;;)
+Line 2197 
 for (;;)
      any byte, even newline, independent of the setting of PCRE_DOTALL. */
      case OP_ANYBYTE:
-     if (eptr++ >= md->end_subject)
+     if (eptr >= md->end_subject)   /* DO NOT merge the eptr++ here; it must */
-       {
+       {                            /* not be updated before SCHECK_PARTIAL. */
        SCHECK_PARTIAL();
        MRRETURN(MATCH_NOMATCH);
        }
+     eptr++;
      ecode++;
      break;
-Line 2000 
 for (;;)
+Line 2318 
 for (;;)
      switch(c)
        {
        default: MRRETURN(MATCH_NOMATCH);
        case 0x000d:
        if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
        break;
-Line 2223 
 for (;;)
+Line 2542 
 for (;;)
        MRRETURN(MATCH_NOMATCH);
        }
      GETCHARINCTEST(c, eptr);
+     if (UCD_CATEGORY(c) == ucp_M) MRRETURN(MATCH_NOMATCH);
+     while (eptr < md->end_subject)
        {
-       int category = UCD_CATEGORY(c);
+       int len = 1;
-       if (category == ucp_M) MRRETURN(MATCH_NOMATCH);
+       if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); }
-       while (eptr < md->end_subject)
+       if (UCD_CATEGORY(c) != ucp_M) break;
-         {
+       eptr += len;
-         int len = 1;
-         if (!utf8) c = *eptr; else
-           {
-           GETCHARLEN(c, eptr, len);
-           }
-         category = UCD_CATEGORY(c);
-         if (category != ucp_M) break;
-         eptr += len;
-         }
        }
      ecode++;
      break;
-Line 2252 
 for (;;)
+Line 2564 
 for (;;)
      loops). */
      case OP_REF:
-       {
+     case OP_REFI:
-       offset = GET2(ecode, 1) << 1;               /* Doubled ref number */
+     caseless = op == OP_REFI;
-       ecode += 3;
+     offset = GET2(ecode, 1) << 1;               /* Doubled ref number */
+     ecode += 3;
-       /* If the reference is unset, there are two possibilities:
+     /* If the reference is unset, there are two possibilities:
-       (a) In the default, Perl-compatible state, set the length to be longer
+     (a) In the default, Perl-compatible state, set the length negative;
-       than the amount of subject left; this ensures that every attempt at a
+     this ensures that every attempt at a match fails. We can't just fail
-       match fails. We can't just fail here, because of the possibility of
+     here, because of the possibility of quantifiers with zero minima.
-       quantifiers with zero minima.
-       (b) If the JavaScript compatibility flag is set, set the length to zero
+     (b) If the JavaScript compatibility flag is set, set the length to zero
-       so that the back reference matches an empty string.
+     so that the back reference matches an empty string.
-       Otherwise, set the length to the length of what was matched by the
+     Otherwise, set the length to the length of what was matched by the
-       referenced subpattern. */
+     referenced subpattern. */
-       if (offset >= offset_top || md->offset_vector[offset] < 0)
+     if (offset >= offset_top || md->offset_vector[offset] < 0)
-         length = (md->jscript_compat)? 0 : (int)(md->end_subject - eptr + 1);
+       length = (md->jscript_compat)? 0 : -1;
-       else
+     else
-         length = md->offset_vector[offset+1] - md->offset_vector[offset];
+       length = md->offset_vector[offset+1] - md->offset_vector[offset];
-       /* Set up for repetition, or handle the non-repeated case */
+     /* Set up for repetition, or handle the non-repeated case */
-       switch (*ecode)
+     switch (*ecode)
-         {
+       {
-         case OP_CRSTAR:
+       case OP_CRSTAR:
-         case OP_CRMINSTAR:
+       case OP_CRMINSTAR:
-         case OP_CRPLUS:
+       case OP_CRPLUS:
-         case OP_CRMINPLUS:
+       case OP_CRMINPLUS:
-         case OP_CRQUERY:
+       case OP_CRQUERY:
-         case OP_CRMINQUERY:
+       case OP_CRMINQUERY:
-         c = *ecode++ - OP_CRSTAR;
+       c = *ecode++ - OP_CRSTAR;
-         minimize = (c & 1) != 0;
+       minimize = (c & 1) != 0;
-         min = rep_min[c];                 /* Pick up values from tables; */
+       min = rep_min[c];                 /* Pick up values from tables; */
-         max = rep_max[c];                 /* zero for max => infinity */
+       max = rep_max[c];                 /* zero for max => infinity */
-         if (max == 0) max = INT_MAX;
+       if (max == 0) max = INT_MAX;
-         break;
+       break;
-         case OP_CRRANGE:
+       case OP_CRRANGE:
-         case OP_CRMINRANGE:
+       case OP_CRMINRANGE:
-         minimize = (*ecode == OP_CRMINRANGE);
+       minimize = (*ecode == OP_CRMINRANGE);
-         min = GET2(ecode, 1);
+       min = GET2(ecode, 1);
-         max = GET2(ecode, 3);
+       max = GET2(ecode, 3);
-         if (max == 0) max = INT_MAX;
+       if (max == 0) max = INT_MAX;
-         ecode += 5;
+       ecode += 5;
-         break;
+       break;
-         default:               /* No repeat follows */
+       default:               /* No repeat follows */
-         if (!match_ref(offset, eptr, length, md, ims))
+       if ((length = match_ref(offset, eptr, length, md, caseless)) < 0)
-           {
+         {
-           CHECK_PARTIAL();
+         CHECK_PARTIAL();
-           MRRETURN(MATCH_NOMATCH);
+         MRRETURN(MATCH_NOMATCH);
-           }
-         eptr += length;
-         continue;              /* With the main loop */
          }
+       eptr += length;
+       continue;              /* With the main loop */
+       }
-       /* If the length of the reference is zero, just continue with the
+     /* Handle repeated back references. If the length of the reference is
-       main loop. */
+     zero, just continue with the main loop. */
-       if (length == 0) continue;
+     if (length == 0) continue;
-       /* First, ensure the minimum number of matches are present. We get back
+     /* First, ensure the minimum number of matches are present. We get back
-       the length of the reference string explicitly rather than passing the
+     the length of the reference string explicitly rather than passing the
-       address of eptr, so that eptr can be a register variable. */
+     address of eptr, so that eptr can be a register variable. */
-       for (i = 1; i <= min; i++)
+     for (i = 1; i <= min; i++)
+       {
+       int slength;
+       if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
          {
-         if (!match_ref(offset, eptr, length, md, ims))
+         CHECK_PARTIAL();
-           {
+         MRRETURN(MATCH_NOMATCH);
-           CHECK_PARTIAL();
-           MRRETURN(MATCH_NOMATCH);
-           }
-         eptr += length;
          }
+       eptr += slength;
+       }
-       /* If min = max, continue at the same level without recursion.
+     /* If min = max, continue at the same level without recursion.
-       They are not both allowed to be zero. */
+     They are not both allowed to be zero. */
-       if (min == max) continue;
+     if (min == max) continue;
-       /* If minimizing, keep trying and advancing the pointer */
+     /* If minimizing, keep trying and advancing the pointer */
-       if (minimize)
+     if (minimize)
+       {
+       for (fi = min;; fi++)
          {
-         for (fi = min;; fi++)
+         int slength;
+         RMATCH(eptr, ecode, offset_top, md, eptrb, RM14);
+         if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+         if (fi >= max) MRRETURN(MATCH_NOMATCH);
+         if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM14);
+           CHECK_PARTIAL();
-           if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+           MRRETURN(MATCH_NOMATCH);
-           if (fi >= max) MRRETURN(MATCH_NOMATCH);
-           if (!match_ref(offset, eptr, length, md, ims))
-             {
-             CHECK_PARTIAL();
-             MRRETURN(MATCH_NOMATCH);
-             }
-           eptr += length;
            }
-         /* Control never gets here */
+         eptr += slength;
          }
+       /* Control never gets here */
+       }
-       /* If maximizing, find the longest string and work backwards */
+     /* If maximizing, find the longest string and work backwards */
-       else
+     else
+       {
+       pp = eptr;
+       for (i = min; i < max; i++)
          {
-         pp = eptr;
+         int slength;
-         for (i = min; i < max; i++)
+         if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
-           {
-           if (!match_ref(offset, eptr, length, md, ims))
-             {
-             CHECK_PARTIAL();
-             break;
-             }
-           eptr += length;
-           }
-         while (eptr >= pp)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM15);
+           CHECK_PARTIAL();
-           if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+           break;
-           eptr -= length;
            }
-         MRRETURN(MATCH_NOMATCH);
+         eptr += slength;
+         }
+       while (eptr >= pp)
+         {
+         RMATCH(eptr, ecode, offset_top, md, eptrb, RM15);
+         if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+         eptr -= length;
          }
+       MRRETURN(MATCH_NOMATCH);
        }
      /* Control never gets here */
-Line 2480 
 for (;;)
+Line 2794 
 for (;;)
            {
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM16);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM16);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 2505 
 for (;;)
+Line 2819 
 for (;;)
            {
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM17);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM17);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 2551 
 for (;;)
+Line 2865 
 for (;;)
              }
            for (;;)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM18);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM18);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (eptr-- == pp) break;        /* Stop if tried at original pos */
              BACKCHAR(eptr);
-Line 2574 
 for (;;)
+Line 2888 
 for (;;)
              }
            while (eptr >= pp)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM19);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM19);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              eptr--;
              }
-Line 2650 
 for (;;)
+Line 2964 
 for (;;)
          {
          for (fi = min;; fi++)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM20);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM20);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max) MRRETURN(MATCH_NOMATCH);
            if (eptr >= md->end_subject)
-Line 2683 
 for (;;)
+Line 2997 
 for (;;)
            }
          for(;;)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM21);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM21);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (eptr-- == pp) break;        /* Stop if tried at original pos */
            if (utf8) BACKCHAR(eptr);
-Line 2728 
 for (;;)
+Line 3042 
 for (;;)
      /* Match a single character, caselessly */
-     case OP_CHARNC:
+     case OP_CHARI:
  #ifdef SUPPORT_UTF8
      if (utf8)
        {
-Line 2788 
 for (;;)
+Line 3102 
 for (;;)
      /* Match a single character repeatedly. */
      case OP_EXACT:
+     case OP_EXACTI:
      min = max = GET2(ecode, 1);
      ecode += 3;
      goto REPEATCHAR;
      case OP_POSUPTO:
+     case OP_POSUPTOI:
      possessive = TRUE;
      /* Fall through */
      case OP_UPTO:
+     case OP_UPTOI:
      case OP_MINUPTO:
+     case OP_MINUPTOI:
      min = 0;
      max = GET2(ecode, 1);
-     minimize = *ecode == OP_MINUPTO;
+     minimize = *ecode == OP_MINUPTO || *ecode == OP_MINUPTOI;
      ecode += 3;
      goto REPEATCHAR;
      case OP_POSSTAR:
+     case OP_POSSTARI:
      possessive = TRUE;
      min = 0;
      max = INT_MAX;
-Line 2812 
 for (;;)
+Line 3131 
 for (;;)
      goto REPEATCHAR;
      case OP_POSPLUS:
+     case OP_POSPLUSI:
      possessive = TRUE;
      min = 1;
      max = INT_MAX;
-Line 2819 
 for (;;)
+Line 3139 
 for (;;)
      goto REPEATCHAR;
      case OP_POSQUERY:
+     case OP_POSQUERYI:
      possessive = TRUE;
      min = 0;
      max = 1;
-Line 2826 
 for (;;)
+Line 3147 
 for (;;)
      goto REPEATCHAR;
      case OP_STAR:
+     case OP_STARI:
      case OP_MINSTAR:
+     case OP_MINSTARI:
      case OP_PLUS:
+     case OP_PLUSI:
      case OP_MINPLUS:
+     case OP_MINPLUSI:
      case OP_QUERY:
+     case OP_QUERYI:
      case OP_MINQUERY:
-     c = *ecode++ - OP_STAR;
+     case OP_MINQUERYI:
+     c = *ecode++ - ((op < OP_STARI)? OP_STAR : OP_STARI);
      minimize = (c & 1) != 0;
      min = rep_min[c];                 /* Pick up values from tables; */
      max = rep_max[c];                 /* zero for max => infinity */
      if (max == 0) max = INT_MAX;
-Line 2856 
 for (;;)
+Line 3182 
 for (;;)
          {
  #ifdef SUPPORT_UCP
          unsigned int othercase;
-         if ((ims & PCRE_CASELESS) != 0 &&
+         if (op >= OP_STARI &&     /* Caseless */
              (othercase = UCD_OTHERCASE(fc)) != fc)
            oclength = _pcre_ord2utf8(othercase, occhars);
          else oclength = 0;
-Line 2884 
 for (;;)
+Line 3210 
 for (;;)
            {
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM22);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM22);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr <= md->end_subject - length &&
-Line 2926 
 for (;;)
+Line 3252 
 for (;;)
            for(;;)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM23);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM23);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (eptr == pp) { MRRETURN(MATCH_NOMATCH); }
  #ifdef SUPPORT_UCP
-Line 2963 
 for (;;)
+Line 3289 
 for (;;)
      DPRINTF(("matching %c{%d,%d} against subject %.*s\n", fc, min, max,
        max, eptr));
-     if ((ims & PCRE_CASELESS) != 0)
+     if (op >= OP_STARI)  /* Caseless */
        {
        fc = md->lcc[fc];
        for (i = 1; i <= min; i++)
-Line 2980 
 for (;;)
+Line 3306 
 for (;;)
          {
          for (fi = min;; fi++)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM24);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM24);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max) MRRETURN(MATCH_NOMATCH);
            if (eptr >= md->end_subject)
-Line 3010 
 for (;;)
+Line 3336 
 for (;;)
          while (eptr >= pp)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM25);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM25);
            eptr--;
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            }
-Line 3039 
 for (;;)
+Line 3365 
 for (;;)
          {
          for (fi = min;; fi++)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM26);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM26);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max) MRRETURN(MATCH_NOMATCH);
            if (eptr >= md->end_subject)
-Line 3068 
 for (;;)
+Line 3394 
 for (;;)
          while (eptr >= pp)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM27);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM27);
            eptr--;
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            }
-Line 3081 
 for (;;)
+Line 3407 
 for (;;)
      checking can be multibyte. */
      case OP_NOT:
+     case OP_NOTI:
      if (eptr >= md->end_subject)
        {
        SCHECK_PARTIAL();
-Line 3088 
 for (;;)
+Line 3415 
 for (;;)
        }
      ecode++;
      GETCHARINCTEST(c, eptr);
-     if ((ims & PCRE_CASELESS) != 0)
+     if (op == OP_NOTI)         /* The caseless case */
        {
  #ifdef SUPPORT_UTF8
        if (c < 256)
-Line 3096 
 for (;;)
+Line 3423 
 for (;;)
        c = md->lcc[c];
        if (md->lcc[*ecode++] == c) MRRETURN(MATCH_NOMATCH);
        }
-     else
+     else    /* Caseful */
        {
        if (*ecode++ == c) MRRETURN(MATCH_NOMATCH);
        }
-Line 3110 
 for (;;)
+Line 3437 
 for (;;)
      about... */
      case OP_NOTEXACT:
+     case OP_NOTEXACTI:
      min = max = GET2(ecode, 1);
      ecode += 3;
      goto REPEATNOTCHAR;
      case OP_NOTUPTO:
+     case OP_NOTUPTOI:
      case OP_NOTMINUPTO:
+     case OP_NOTMINUPTOI:
      min = 0;
      max = GET2(ecode, 1);
-     minimize = *ecode == OP_NOTMINUPTO;
+     minimize = *ecode == OP_NOTMINUPTO || *ecode == OP_NOTMINUPTOI;
      ecode += 3;
      goto REPEATNOTCHAR;
      case OP_NOTPOSSTAR:
+     case OP_NOTPOSSTARI:
      possessive = TRUE;
      min = 0;
      max = INT_MAX;
-Line 3130 
 for (;;)
+Line 3461 
 for (;;)
      goto REPEATNOTCHAR;
      case OP_NOTPOSPLUS:
+     case OP_NOTPOSPLUSI:
      possessive = TRUE;
      min = 1;
      max = INT_MAX;
-Line 3137 
 for (;;)
+Line 3469 
 for (;;)
      goto REPEATNOTCHAR;
      case OP_NOTPOSQUERY:
+     case OP_NOTPOSQUERYI:
      possessive = TRUE;
      min = 0;
      max = 1;
-Line 3144 
 for (;;)
+Line 3477 
 for (;;)
      goto REPEATNOTCHAR;
      case OP_NOTPOSUPTO:
+     case OP_NOTPOSUPTOI:
      possessive = TRUE;
      min = 0;
      max = GET2(ecode, 1);
-Line 3151 
 for (;;)
+Line 3485 
 for (;;)
      goto REPEATNOTCHAR;
      case OP_NOTSTAR:
+     case OP_NOTSTARI:
      case OP_NOTMINSTAR:
+     case OP_NOTMINSTARI:
      case OP_NOTPLUS:
+     case OP_NOTPLUSI:
      case OP_NOTMINPLUS:
+     case OP_NOTMINPLUSI:
      case OP_NOTQUERY:
+     case OP_NOTQUERYI:
      case OP_NOTMINQUERY:
-     c = *ecode++ - OP_NOTSTAR;
+     case OP_NOTMINQUERYI:
+     c = *ecode++ - ((op >= OP_NOTSTARI)? OP_NOTSTARI: OP_NOTSTAR);
      minimize = (c & 1) != 0;
      min = rep_min[c];                 /* Pick up values from tables; */
      max = rep_max[c];                 /* zero for max => infinity */
-Line 3178 
 for (;;)
+Line 3518 
 for (;;)
      DPRINTF(("negative matching %c{%d,%d} against subject %.*s\n", fc, min, max,
        max, eptr));
-     if ((ims & PCRE_CASELESS) != 0)
+     if (op >= OP_NOTSTARI)     /* Caseless */
        {
        fc = md->lcc[fc];
-Line 3226 
 for (;;)
+Line 3566 
 for (;;)
            register unsigned int d;
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM28);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM28);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 3245 
 for (;;)
+Line 3585 
 for (;;)
            {
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM29);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM29);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 3286 
 for (;;)
+Line 3626 
 for (;;)
          if (possessive) continue;
          for(;;)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM30);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM30);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (eptr-- == pp) break;        /* Stop if tried at original pos */
              BACKCHAR(eptr);
-Line 3309 
 for (;;)
+Line 3649 
 for (;;)
            if (possessive) continue;
            while (eptr >= pp)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM31);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM31);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              eptr--;
              }
-Line 3366 
 for (;;)
+Line 3706 
 for (;;)
            register unsigned int d;
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM32);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM32);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 3384 
 for (;;)
+Line 3724 
 for (;;)
            {
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM33);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM33);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 3424 
 for (;;)
+Line 3764 
 for (;;)
            if (possessive) continue;
            for(;;)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM34);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM34);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (eptr-- == pp) break;        /* Stop if tried at original pos */
              BACKCHAR(eptr);
-Line 3447 
 for (;;)
+Line 3787 
 for (;;)
            if (possessive) continue;
            while (eptr >= pp)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM35);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM35);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              eptr--;
              }
-Line 3562 
 for (;;)
+Line 3902 
 for (;;)
            case PT_LAMP:
            for (i = 1; i <= min; i++)
              {
+             int chartype;
              if (eptr >= md->end_subject)
                {
                SCHECK_PARTIAL();
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_chartype = UCD_CHARTYPE(c);
+             chartype = UCD_CHARTYPE(c);
-             if ((prop_chartype == ucp_Lu ||
+             if ((chartype == ucp_Lu ||
-                  prop_chartype == ucp_Ll ||
+                  chartype == ucp_Ll ||
-                  prop_chartype == ucp_Lt) == prop_fail_result)
+                  chartype == ucp_Lt) == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            break;
-Line 3585 
 for (;;)
+Line 3926 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == prop_value) == prop_fail_result)
-             if ((prop_category == prop_value) == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            break;
-Line 3600 
 for (;;)
+Line 3940 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_chartype = UCD_CHARTYPE(c);
+             if ((UCD_CHARTYPE(c) == prop_value) == prop_fail_result)
-             if ((prop_chartype == prop_value) == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            break;
-Line 3615 
 for (;;)
+Line 3954 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_script = UCD_SCRIPT(c);
+             if ((UCD_SCRIPT(c) == prop_value) == prop_fail_result)
-             if ((prop_script == prop_value) == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            break;
-Line 3624 
 for (;;)
+Line 3962 
 for (;;)
            case PT_ALNUM:
            for (i = 1; i <= min; i++)
              {
+             int category;
              if (eptr >= md->end_subject)
                {
                SCHECK_PARTIAL();
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             category = UCD_CATEGORY(c);
-             if ((prop_category == ucp_L || prop_category == ucp_N)
+             if ((category == ucp_L || category == ucp_N) == prop_fail_result)
-                    == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            break;
-Line 3646 
 for (;;)
+Line 3984 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
-             if ((prop_category == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
                   c == CHAR_FF || c == CHAR_CR)
                     == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
-Line 3663 
 for (;;)
+Line 4000 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
-             if ((prop_category == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
                   c == CHAR_VT || c == CHAR_FF || c == CHAR_CR)
                     == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
-Line 3674 
 for (;;)
+Line 4010 
 for (;;)
            case PT_WORD:
            for (i = 1; i <= min; i++)
              {
+             int category;
              if (eptr >= md->end_subject)
                {
                SCHECK_PARTIAL();
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             category = UCD_CATEGORY(c);
-             if ((prop_category == ucp_L || prop_category == ucp_N ||
+             if ((category == ucp_L || category == ucp_N || c == CHAR_UNDERSCORE)
-                  c == CHAR_UNDERSCORE)
                     == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
-Line 3708 
 for (;;)
+Line 4044 
 for (;;)
              MRRETURN(MATCH_NOMATCH);
              }
            GETCHARINCTEST(c, eptr);
-           prop_category = UCD_CATEGORY(c);
+           if (UCD_CATEGORY(c) == ucp_M) MRRETURN(MATCH_NOMATCH);
-           if (prop_category == ucp_M) MRRETURN(MATCH_NOMATCH);
            while (eptr < md->end_subject)
              {
              int len = 1;
-             if (!utf8) c = *eptr;
+             if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); }
-               else { GETCHARLEN(c, eptr, len); }
+             if (UCD_CATEGORY(c) != ucp_M) break;
-             prop_category = UCD_CATEGORY(c);
-             if (prop_category != ucp_M) break;
              eptr += len;
              }
            }
-Line 3774 
 for (;;)
+Line 4107 
 for (;;)
            switch(c)
              {
              default: MRRETURN(MATCH_NOMATCH);
              case 0x000d:
              if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
              break;
-Line 4050 
 for (;;)
+Line 4384 
 for (;;)
            switch(*eptr++)
              {
              default: MRRETURN(MATCH_NOMATCH);
              case 0x000d:
              if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
              break;
              case 0x000a:
              break;
-Line 4242 
 for (;;)
+Line 4578 
 for (;;)
            case PT_ANY:
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM36);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM36);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4258 
 for (;;)
+Line 4594 
 for (;;)
            case PT_LAMP:
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM37);
+             int chartype;
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM37);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4267 
 for (;;)
+Line 4604 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_chartype = UCD_CHARTYPE(c);
+             chartype = UCD_CHARTYPE(c);
-             if ((prop_chartype == ucp_Lu ||
+             if ((chartype == ucp_Lu ||
-                  prop_chartype == ucp_Ll ||
+                  chartype == ucp_Ll ||
-                  prop_chartype == ucp_Lt) == prop_fail_result)
+                  chartype == ucp_Lt) == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
-Line 4278 
 for (;;)
+Line 4615 
 for (;;)
            case PT_GC:
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM38);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM38);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4287 
 for (;;)
+Line 4624 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == prop_value) == prop_fail_result)
-             if ((prop_category == prop_value) == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
-Line 4296 
 for (;;)
+Line 4632 
 for (;;)
            case PT_PC:
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM39);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM39);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4305 
 for (;;)
+Line 4641 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_chartype = UCD_CHARTYPE(c);
+             if ((UCD_CHARTYPE(c) == prop_value) == prop_fail_result)
-             if ((prop_chartype == prop_value) == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
-Line 4314 
 for (;;)
+Line 4649 
 for (;;)
            case PT_SC:
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM40);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM40);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4323 
 for (;;)
+Line 4658 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_script = UCD_SCRIPT(c);
+             if ((UCD_SCRIPT(c) == prop_value) == prop_fail_result)
-             if ((prop_script == prop_value) == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
-Line 4332 
 for (;;)
+Line 4666 
 for (;;)
            case PT_ALNUM:
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM59);
+             int category;
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM59);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4341 
 for (;;)
+Line 4676 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             category = UCD_CATEGORY(c);
-             if ((prop_category == ucp_L || prop_category == ucp_N)
+             if ((category == ucp_L || category == ucp_N) == prop_fail_result)
-                    == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
              }
            /* Control never gets here */
-Line 4351 
 for (;;)
+Line 4685 
 for (;;)
            case PT_SPACE:    /* Perl space */
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM60);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM60);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4360 
 for (;;)
+Line 4694 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
-             if ((prop_category == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
                   c == CHAR_FF || c == CHAR_CR)
                     == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
-Line 4371 
 for (;;)
+Line 4704 
 for (;;)
            case PT_PXSPACE:  /* POSIX space */
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM61);
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM61);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4380 
 for (;;)
+Line 4713 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
-             if ((prop_category == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
                   c == CHAR_VT || c == CHAR_FF || c == CHAR_CR)
                     == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
-Line 4391 
 for (;;)
+Line 4723 
 for (;;)
            case PT_WORD:
            for (fi = min;; fi++)
              {
-             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM62);
+             int category;
+             RMATCH(eptr, ecode, offset_top, md, eptrb, RM62);
              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
              if (fi >= max) MRRETURN(MATCH_NOMATCH);
              if (eptr >= md->end_subject)
-Line 4400 
 for (;;)
+Line 4733 
 for (;;)
                MRRETURN(MATCH_NOMATCH);
                }
              GETCHARINCTEST(c, eptr);
-             prop_category = UCD_CATEGORY(c);
+             category = UCD_CATEGORY(c);
-             if ((prop_category == ucp_L ||
+             if ((category == ucp_L ||
-                  prop_category == ucp_N ||
+                  category == ucp_N ||
                   c == CHAR_UNDERSCORE)
                     == prop_fail_result)
                MRRETURN(MATCH_NOMATCH);
-Line 4423 
 for (;;)
+Line 4756 
 for (;;)
          {
          for (fi = min;; fi++)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM41);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM41);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max) MRRETURN(MATCH_NOMATCH);
            if (eptr >= md->end_subject)
-Line 4432 
 for (;;)
+Line 4765 
 for (;;)
              MRRETURN(MATCH_NOMATCH);
              }
            GETCHARINCTEST(c, eptr);
-           prop_category = UCD_CATEGORY(c);
+           if (UCD_CATEGORY(c) == ucp_M) MRRETURN(MATCH_NOMATCH);
-           if (prop_category == ucp_M) MRRETURN(MATCH_NOMATCH);
            while (eptr < md->end_subject)
              {
              int len = 1;
-             if (!utf8) c = *eptr;
+             if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); }
-               else { GETCHARLEN(c, eptr, len); }
+             if (UCD_CATEGORY(c) != ucp_M) break;
-             prop_category = UCD_CATEGORY(c);
-             if (prop_category != ucp_M) break;
              eptr += len;
              }
            }
          }
        else
  #endif     /* SUPPORT_UCP */
-Line 4455 
 for (;;)
+Line 4784 
 for (;;)
          {
          for (fi = min;; fi++)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM42);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM42);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max) MRRETURN(MATCH_NOMATCH);
            if (eptr >= md->end_subject)
-Line 4618 
 for (;;)
+Line 4947 
 for (;;)
          {
          for (fi = min;; fi++)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM43);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM43);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (fi >= max) MRRETURN(MATCH_NOMATCH);
            if (eptr >= md->end_subject)
-Line 4766 
 for (;;)
+Line 5095 
 for (;;)
            case PT_LAMP:
            for (i = min; i < max; i++)
              {
+             int chartype;
              int len = 1;
              if (eptr >= md->end_subject)
                {
-Line 4773 
 for (;;)
+Line 5103 
 for (;;)
                break;
                }
              GETCHARLENTEST(c, eptr, len);
-             prop_chartype = UCD_CHARTYPE(c);
+             chartype = UCD_CHARTYPE(c);
-             if ((prop_chartype == ucp_Lu ||
+             if ((chartype == ucp_Lu ||
-                  prop_chartype == ucp_Ll ||
+                  chartype == ucp_Ll ||
-                  prop_chartype == ucp_Lt) == prop_fail_result)
+                  chartype == ucp_Lt) == prop_fail_result)
                break;
              eptr+= len;
              }
-Line 4792 
 for (;;)
+Line 5122 
 for (;;)
                break;
                }
              GETCHARLENTEST(c, eptr, len);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == prop_value) == prop_fail_result) break;
-             if ((prop_category == prop_value) == prop_fail_result)
-               break;
              eptr+= len;
              }
            break;
-Line 4809 
 for (;;)
+Line 5137 
 for (;;)
                break;
                }
              GETCHARLENTEST(c, eptr, len);
-             prop_chartype = UCD_CHARTYPE(c);
+             if ((UCD_CHARTYPE(c) == prop_value) == prop_fail_result) break;
-             if ((prop_chartype == prop_value) == prop_fail_result)
-               break;
              eptr+= len;
              }
            break;
-Line 4826 
 for (;;)
+Line 5152 
 for (;;)
                break;
                }
              GETCHARLENTEST(c, eptr, len);
-             prop_script = UCD_SCRIPT(c);
+             if ((UCD_SCRIPT(c) == prop_value) == prop_fail_result) break;
-             if ((prop_script == prop_value) == prop_fail_result)
-               break;
              eptr+= len;
              }
            break;
-Line 4836 
 for (;;)
+Line 5160 
 for (;;)
            case PT_ALNUM:
            for (i = min; i < max; i++)
              {
+             int category;
              int len = 1;
              if (eptr >= md->end_subject)
                {
-Line 4843 
 for (;;)
+Line 5168 
 for (;;)
                break;
                }
              GETCHARLENTEST(c, eptr, len);
-             prop_category = UCD_CATEGORY(c);
+             category = UCD_CATEGORY(c);
-             if ((prop_category == ucp_L || prop_category == ucp_N)
+             if ((category == ucp_L || category == ucp_N) == prop_fail_result)
-                  == prop_fail_result)
                break;
              eptr+= len;
              }
-Line 4861 
 for (;;)
+Line 5185 
 for (;;)
                break;
                }
              GETCHARLENTEST(c, eptr, len);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
-             if ((prop_category == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
                   c == CHAR_FF || c == CHAR_CR)
                   == prop_fail_result)
                break;
-Line 4880 
 for (;;)
+Line 5203 
 for (;;)
                break;
                }
              GETCHARLENTEST(c, eptr, len);
-             prop_category = UCD_CATEGORY(c);
+             if ((UCD_CATEGORY(c) == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
-             if ((prop_category == ucp_Z || c == CHAR_HT || c == CHAR_NL ||
                   c == CHAR_VT || c == CHAR_FF || c == CHAR_CR)
                   == prop_fail_result)
                break;
-Line 4892 
 for (;;)
+Line 5214 
 for (;;)
            case PT_WORD:
            for (i = min; i < max; i++)
              {
+             int category;
              int len = 1;
              if (eptr >= md->end_subject)
                {
-Line 4899 
 for (;;)
+Line 5222 
 for (;;)
                break;
                }
              GETCHARLENTEST(c, eptr, len);
-             prop_category = UCD_CATEGORY(c);
+             category = UCD_CATEGORY(c);
-             if ((prop_category == ucp_L || prop_category == ucp_N ||
+             if ((category == ucp_L || category == ucp_N ||
                   c == CHAR_UNDERSCORE) == prop_fail_result)
                break;
              eptr+= len;
-Line 4916 
 for (;;)
+Line 5239 
 for (;;)
          if (possessive) continue;
          for(;;)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM44);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM44);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (eptr-- == pp) break;        /* Stop if tried at original pos */
            if (utf8) BACKCHAR(eptr);
-Line 4930 
 for (;;)
+Line 5253 
 for (;;)
          {
          for (i = min; i < max; i++)
            {
+           int len = 1;
            if (eptr >= md->end_subject)
              {
              SCHECK_PARTIAL();
              break;
              }
-           GETCHARINCTEST(c, eptr);
+           if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); }
-           prop_category = UCD_CATEGORY(c);
+           if (UCD_CATEGORY(c) == ucp_M) break;
-           if (prop_category == ucp_M) break;
+           eptr += len;
            while (eptr < md->end_subject)
              {
-             int len = 1;
+             len = 1;
-             if (!utf8) c = *eptr; else
+             if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); }
-               {
+             if (UCD_CATEGORY(c) != ucp_M) break;
-               GETCHARLEN(c, eptr, len);
-               }
-             prop_category = UCD_CATEGORY(c);
-             if (prop_category != ucp_M) break;
              eptr += len;
              }
            }
-Line 4957 
 for (;;)
+Line 5277 
 for (;;)
          for(;;)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM45);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM45);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (eptr-- == pp) break;        /* Stop if tried at original pos */
            for (;;)                        /* Move back over one extended */
              {
-             int len = 1;
              if (!utf8) c = *eptr; else
                {
                BACKCHAR(eptr);
-               GETCHARLEN(c, eptr, len);
+               GETCHAR(c, eptr);
                }
-             prop_category = UCD_CATEGORY(c);
+             if (UCD_CATEGORY(c) != ucp_M) break;
-             if (prop_category != ucp_M) break;
              eptr--;
              }
            }
-Line 5033 
 for (;;)
+Line 5351 
 for (;;)
                while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;
                }
              }
-           else eptr = md->end_subject;   /* Unlimited UTF-8 repeat */
+           else
+             {
+             eptr = md->end_subject;   /* Unlimited UTF-8 repeat */
+             SCHECK_PARTIAL();
+             }
            break;
            /* The byte case is the same as non-UTF8 */
-Line 5241 
 for (;;)
+Line 5563 
 for (;;)
            RRETURN(PCRE_ERROR_INTERNAL);
            }
-         /* eptr is now past the end of the maximum run */
+         /* eptr is now past the end of the maximum run. If possessive, we are
+         done (no backing up). Otherwise, match at this position; anything other
+         than no match is immediately returned. For nomatch, back up one
+         character, unless we are matching \R and the last thing matched was
+         \r\n, in which case, back up two bytes. */
          if (possessive) continue;
          for(;;)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM46);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM46);
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
            if (eptr-- == pp) break;        /* Stop if tried at original pos */
            BACKCHAR(eptr);
+           if (ctype == OP_ANYNL && eptr > pp  && *eptr == '\n' &&
+               eptr[-1] == '\r') eptr--;
            }
          }
        else
-Line 5448 
 for (;;)
+Line 5776 
 for (;;)
            RRETURN(PCRE_ERROR_INTERNAL);
            }
-         /* eptr is now past the end of the maximum run */
+         /* eptr is now past the end of the maximum run. If possessive, we are
+         done (no backing up). Otherwise, match at this position; anything other
+         than no match is immediately returned. For nomatch, back up one
+         character (byte), unless we are matching \R and the last thing matched
+         was \r\n, in which case, back up two bytes. */
          if (possessive) continue;
          while (eptr >= pp)
            {
-           RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM47);
+           RMATCH(eptr, ecode, offset_top, md, eptrb, RM47);
-           eptr--;
            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
+           eptr--;
+           if (ctype == OP_ANYNL && eptr > pp  && *eptr == '\n' &&
+               eptr[-1] == '\r') eptr--;
            }
          }
-Line 5494 
 switch (frame->Xwhere)
+Line 5828 
 switch (frame->Xwhere)
    LBL( 9) LBL(10) LBL(11) LBL(12) LBL(13) LBL(14) LBL(15) LBL(17)
    LBL(19) LBL(24) LBL(25) LBL(26) LBL(27) LBL(29) LBL(31) LBL(33)
    LBL(35) LBL(43) LBL(47) LBL(48) LBL(49) LBL(50) LBL(51) LBL(52)
-   LBL(53) LBL(54) LBL(55) LBL(56) LBL(57) LBL(58)
+   LBL(53) LBL(54) LBL(55) LBL(56) LBL(57) LBL(58) LBL(63) LBL(64)
+   LBL(65) LBL(66)
  #ifdef SUPPORT_UTF8
    LBL(16) LBL(18) LBL(20) LBL(21) LBL(22) LBL(23) LBL(28) LBL(30)
    LBL(32) LBL(34) LBL(42) LBL(46)
-Line 5523 
 Undefine all the macros that were define
+Line 5858 
 Undefine all the macros that were define
  #undef ecode
  #undef mstart
  #undef offset_top
- #undef ims
  #undef eptrb
  #undef flags
-Line 5541 
 Undefine all the macros that were define
+Line 5875 
 Undefine all the macros that were define
  #undef condition
  #undef prev_is_word
- #undef original_ims
  #undef ctype
  #undef length
  #undef max
-Line 5599 
 pcre_exec(const pcre *argument_re, const
+Line 5931 
 pcre_exec(const pcre *argument_re, const
    PCRE_SPTR subject, int length, int start_offset, int options, int *offsets,
    int offsetcount)
  {
- int rc, resetcount, ocount;
+ int rc, ocount, arg_offset_max;
  int first_byte = -1;
  int req_byte = -1;
  int req_byte2 = -1;
  int newline;
- unsigned long int ims;
  BOOL using_temporary_offsets = FALSE;
  BOOL anchored;
  BOOL startline;
-Line 5636 
 if (re == NULL || subject == NULL ||
+Line 5967 
 if (re == NULL || subject == NULL ||
  if (offsetcount < 0) return PCRE_ERROR_BADCOUNT;
  if (start_offset < 0 || start_offset > length) return PCRE_ERROR_BADOFFSET;
- /* This information is for finding all the numbers associated with a given
+ /* These two settings are used in the code for checking a UTF-8 string that
- name, for condition testing. */
+ follows immediately afterwards. Other values in the md block are used only
+ during "normal" pcre_exec() processing, not when the JIT support is in use,
+ so they are set up later. */
+ utf8 = md->utf8 = (re->options & PCRE_UTF8) != 0;
+ md->partial = ((options & PCRE_PARTIAL_HARD) != 0)? 2 :
+               ((options & PCRE_PARTIAL_SOFT) != 0)? 1 : 0;
+ /* Check a UTF-8 string if required. Pass back the character offset and error
+ code for an invalid string if a results vector is available. */
+ #ifdef SUPPORT_UTF8
+ if (utf8 && (options & PCRE_NO_UTF8_CHECK) == 0)
+   {
+   int erroroffset;
+   int errorcode = _pcre_valid_utf8((USPTR)subject, length, &erroroffset);
+   if (errorcode != 0)
+     {
+     if (offsetcount >= 2)
+       {
+       offsets[0] = erroroffset;
+       offsets[1] = errorcode;
+       }
+     return (errorcode <= PCRE_UTF8_ERR5 && md->partial > 1)?
+       PCRE_ERROR_SHORTUTF8 : PCRE_ERROR_BADUTF8;
+     }
+   /* Check that a start_offset points to the start of a UTF-8 character. */
+   if (start_offset > 0 && start_offset < length &&
+       (((USPTR)subject)[start_offset] & 0xc0) == 0x80)
+     return PCRE_ERROR_BADUTF8_OFFSET;
+   }
+ #endif
+ /* If the pattern was successfully studied with JIT support, run the JIT
+ executable instead of the rest of this function. Most options must be set at
+ compile time for the JIT code to be usable. Fallback to the normal code path if
+ an unsupported flag is set. In particular, JIT does not support partial
+ matching. */
+ #ifdef SUPPORT_JIT
+ if (extra_data != NULL
+     && (extra_data->flags & PCRE_EXTRA_EXECUTABLE_JIT) != 0
+     && extra_data->executable_jit != NULL
+     && (extra_data->flags & PCRE_EXTRA_TABLES) == 0
+     && (options & ~(PCRE_NO_UTF8_CHECK | PCRE_NOTBOL | PCRE_NOTEOL |
+                     PCRE_NOTEMPTY | PCRE_NOTEMPTY_ATSTART)) == 0)
+   return _pcre_jit_exec(re, extra_data->executable_jit, subject, length,
+     start_offset, options, ((extra_data->flags & PCRE_EXTRA_MATCH_LIMIT) == 0)
+     ? MATCH_LIMIT : extra_data->match_limit, offsets, offsetcount);
+ #endif
+ /* Carry on with non-JIT matching. This information is for finding all the
+ numbers associated with a given name, for condition testing. */
  md->name_table = (uschar *)re + re->name_table_offset;
  md->name_count = re->name_count;
-Line 5704 
 md->end_subject = md->start_subject + le
+Line 6088 
 md->end_subject = md->start_subject + le
  end_subject = md->end_subject;
  md->endonly = (re->options & PCRE_DOLLAR_ENDONLY) != 0;
- utf8 = md->utf8 = (re->options & PCRE_UTF8) != 0;
  md->use_ucp = (re->options & PCRE_UCP) != 0;
  md->jscript_compat = (re->options & PCRE_JAVASCRIPT_COMPAT) != 0;
+ /* Some options are unpacked into BOOL variables in the hope that testing
+ them will be faster than individual option bits. */
  md->notbol = (options & PCRE_NOTBOL) != 0;
  md->noteol = (options & PCRE_NOTEOL) != 0;
  md->notempty = (options & PCRE_NOTEMPTY) != 0;
  md->notempty_atstart = (options & PCRE_NOTEMPTY_ATSTART) != 0;
- md->partial = ((options & PCRE_PARTIAL_HARD) != 0)? 2 :
-               ((options & PCRE_PARTIAL_SOFT) != 0)? 1 : 0;
  md->hitend = FALSE;
  md->mark = NULL;                        /* In case never set */
  md->recursive = NULL;                   /* No recursion at top level */
+ md->hasthen = (re->flags & PCRE_HASTHEN) != 0;
  md->lcc = tables + lcc_offset;
  md->ctypes = tables + ctypes_offset;
-Line 5795 
 defined (though never set). So there's n
+Line 6181 
 defined (though never set). So there's n
  if (md->partial && (re->flags & PCRE_NOPARTIAL) != 0)
    return PCRE_ERROR_BADPARTIAL;
- /* Check a UTF-8 string if required. Unfortunately there's no way of passing
- back the character offset. */
- #ifdef SUPPORT_UTF8
- if (utf8 && (options & PCRE_NO_UTF8_CHECK) == 0)
-   {
-   if (_pcre_valid_utf8((USPTR)subject, length) >= 0)
-     return PCRE_ERROR_BADUTF8;
-   if (start_offset > 0 && start_offset < length)
-     {
-     int tb = ((USPTR)subject)[start_offset] & 0xc0;
-     if (tb == 0x80) return PCRE_ERROR_BADUTF8_OFFSET;
-     }
-   }
- #endif
- /* The ims options can vary during the matching as a result of the presence
- of (?ims) items in the pattern. They are kept in a local variable so that
- restoring at the exit of a group is easy. */
- ims = re->options & (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL);
  /* If the expression has got more back references than the offsets supplied can
  hold, we get a temporary chunk of working store to use during the matching.
  Otherwise, we can use the vector supplied, rounding down its size to a multiple
  of 3. */
  ocount = offsetcount - (offsetcount % 3);
+ arg_offset_max = (2*ocount)/3;
  if (re->top_backref > 0 && re->top_backref >= ocount/3)
    {
-Line 5839 
 md->offset_max = (2*ocount)/3;
+Line 6204 
 md->offset_max = (2*ocount)/3;
  md->offset_overflow = FALSE;
  md->capture_last = -1;
- /* Compute the minimum number of offsets that we need to reset each time. Doing
- this makes a huge difference to execution time when there aren't many brackets
- in the pattern. */
- resetcount = 2 + re->top_bracket * 2;
- if (resetcount > offsetcount) resetcount = ocount;
  /* Reset the working variable associated with each extraction. These should
  never be used unless previously set, but they get saved and restored, and so we
- initialize them to avoid reading uninitialized locations. */
+ initialize them to avoid reading uninitialized locations. Also, unset the
+ offsets for the matched string. This is really just for tidiness with callouts,
+ in case they inspect these fields. */
  if (md->offset_vector != NULL)
    {
    register int *iptr = md->offset_vector + ocount;
-   register int *iend = iptr - resetcount/2 + 1;
+   register int *iend = iptr - re->top_bracket;
+   if (iend < md->offset_vector + 2) iend = md->offset_vector + 2;
    while (--iptr >= iend) *iptr = -1;
+   md->offset_vector[0] = md->offset_vector[1] = -1;
    }
  /* Set up the first character to match, if available. The first_byte value is
-Line 5888 
 if ((re->flags & PCRE_REQCHSET) != 0)
+Line 6250 
 if ((re->flags & PCRE_REQCHSET) != 0)
    }
  /* ==========================================================================*/
  /* Loop for handling unanchored repeated matching attempts; for anchored regexs
-Line 5898 
 for(;;)
+Line 6262 
 for(;;)
    USPTR save_end_subject = end_subject;
    USPTR new_start_match;
-   /* Reset the maximum number of extractions we might see. */
-   if (md->offset_vector != NULL)
-     {
-     register int *iptr = md->offset_vector;
-     register int *iend = iptr + resetcount;
-     while (iptr < iend) *iptr++ = -1;
-     }
    /* If firstline is TRUE, the start of the match is constrained to the first
    line of a multiline string. That is, the match must be before or at the first
    newline. Implement this by temporarily adjusting end_subject so that we stop
-Line 5934 
 for(;;)
+Line 6289 
 for(;;)
    /* There are some optimizations that avoid running the match if a known
    starting point is not found, or if a known later character is not present.
    However, there is an option that disables these, for testing and for ensuring
-   that all callouts do actually occur. */
+   that all callouts do actually occur. The option can be set in the regex by
+   (*NO_START_OPT) or passed in match-time options. */
-   if ((options & PCRE_NO_START_OPTIMIZE) == 0)
+   if (((options | re->options) & PCRE_NO_START_OPTIMIZE) == 0)
      {
      /* Advance to a unique first byte if there is one. */
-Line 6011 
 for(;;)
+Line 6367 
 for(;;)
    /* The following two optimizations are disabled for partial matching or if
    disabling is explicitly requested. */
-   if ((options & PCRE_NO_START_OPTIMIZE) == 0 && !md->partial)
+   if (((options | re->options) & PCRE_NO_START_OPTIMIZE) == 0 && !md->partial)
      {
      /* If the pattern was studied, a minimum subject length may be set. This is
      a lower bound; no actual string of that length may actually match the
-Line 6094 
 for(;;)
+Line 6450 
 for(;;)
    md->start_match_ptr = start_match;
    md->start_used_ptr = start_match;
    md->match_call_count = 0;
-   rc = match(start_match, md->start_code, start_match, NULL, 2, md, ims, NULL,
+   md->match_function_type = 0;
-, 0);
+   md->end_offset_top = 0;
+   rc = match(start_match, md->start_code, start_match, NULL, 2, md, NULL, 0);
    if (md->hitend && start_partial == NULL) start_partial = md->start_used_ptr;
    switch(rc)
-Line 6205 
 if (rc == MATCH_MATCH || rc == MATCH_ACC
+Line 6562 
 if (rc == MATCH_MATCH || rc == MATCH_ACC
    {
    if (using_temporary_offsets)
      {
-     if (offsetcount >= 4)
+     if (arg_offset_max >= 4)
        {
        memcpy(offsets + 2, md->offset_vector + 2,
-         (offsetcount - 2) * sizeof(int));
+         (arg_offset_max - 2) * sizeof(int));
        DPRINTF(("Copied offsets from temporary memory\n"));
        }
-     if (md->end_offset_top > offsetcount) md->offset_overflow = TRUE;
+     if (md->end_offset_top > arg_offset_max) md->offset_overflow = TRUE;
      DPRINTF(("Freeing temporary memory\n"));
      (pcre_free)(md->offset_vector);
      }
-   /* Set the return code to the number of captured strings, or 0 if there are
+   /* Set the return code to the number of captured strings, or 0 if there were
    too many to fit into the vector. */
-   rc = md->offset_overflow? 0 : md->end_offset_top/2;
+   rc = (md->offset_overflow && md->end_offset_top >= arg_offset_max)?
+: md->end_offset_top/2;
+   /* If there is space in the offset vector, set any unused pairs at the end of
+   the pattern to -1 for backwards compatibility. It is documented that this
+   happens. In earlier versions, the whole set of potential capturing offsets
+   was set to -1 each time round the loop, but this is handled differently now.
+   "Gaps" are set to -1 dynamically instead (this fixes a bug). Thus, it is only
+   those at the end that need unsetting here. We can't just unset them all at
+   the start of the whole thing because they may get set in one branch that is
+   not the final matching branch. */
+   if (md->end_offset_top/2 <= re->top_bracket && offsets != NULL)
+     {
+     register int *iptr, *iend;
+     int resetcount = 2 + re->top_bracket * 2;
+     if (resetcount > offsetcount) resetcount = ocount;
+     iptr = offsets + md->end_offset_top;
+     iend = offsets + resetcount;
+     while (iptr < iend) *iptr++ = -1;
+     }
    /* If there is space, set up the whole thing as substring 0. The value of
    md->start_match_ptr might be modified if \K was encountered on the success

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+Added in v.743

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