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-revision 622 by ph10,
Mon Jul 18 10:46:51 2011 UTC
+revision 986 by zherczeg,
Sat Jul  7 03:33:54 2012 UTC
 Line 1
  ChangeLog for PCRE
  ------------------
- Version 8.13 30-Apr-2011
+ Version 8.32
+ ------------
+.  Improved JIT compiler optimizations for first character search and single
+     character iterators.
+ Version 8.31 06-July-2012
+ -------------------------
+.  Fixing a wrong JIT test case and some compiler warnings.
+.  Removed a bashism from the RunTest script.
+.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
+     to unsigned type, result still unsigned" that was given by an MS compiler
+     on encountering the code "-sizeof(xxx)".
+.  Partial matching support is added to the JIT compiler.
+.  Fixed several bugs concerned with partial matching of items that consist
+     of more than one character:
+     (a) /^(..)\1/ did not partially match "aba" because checking references was
+         done on an "all or nothing" basis. This also applied to repeated
+         references.
+     (b) \R did not give a hard partial match if \r was found at the end of the
+         subject.
+     (c) \X did not give a hard partial match after matching one or more
+         characters at the end of the subject.
+     (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
+         a partial match for the string "\r".
+     (e) When newline was set to CRLF, the metacharacter "." did not recognize
+         a partial match for a CR character at the end of the subject string.
+.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
+     running pcretest, the text "(JIT)" added to the output whenever JIT is
+     actually used to run the match.
+.  Individual JIT compile options can be set in pcretest by following -s+[+]
+     or /S+[+] with a digit between 1 and 7.
+.  OP_NOT now supports any UTF character not just single-byte ones.
+.  (*MARK) control verb is now supported by the JIT compiler.
+. The command "./RunTest list" lists the available tests without actually
+     running any of them. (Because I keep forgetting what they all are.)
+. Add PCRE_INFO_MAXLOOKBEHIND.
+. Applied a (slightly modified) user-supplied patch that improves performance
+     when the heap is used for recursion (compiled with --disable-stack-for-
+     recursion). Instead of malloc and free for each heap frame each time a
+     logical recursion happens, frames are retained on a chain and re-used where
+     possible. This sometimes gives as much as 30% improvement.
+. As documented, (*COMMIT) is now confined to within a recursive subpattern
+     call.
+. As documented, (*COMMIT) is now confined to within a positive assertion.
+. It is now possible to link pcretest with libedit as an alternative to
+     libreadline.
+. (*COMMIT) control verb is now supported by the JIT compiler.
+. The Unicode data tables have been updated to Unicode 6.1.0.
+. Added --file-list option to pcregrep.
+. Added binary file support to pcregrep, including the -a, --binary-files,
+     -I, and --text options.
+. The madvise function is renamed for posix_madvise for QNX compatibility
+     reasons. Fixed by Giuseppe D'Angelo.
+. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
+. Changed the option for creating symbolic links for 16-bit man pages from
+     -s to -sf so that re-installing does not cause issues.
+. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
+. Fixed a very old bug in pcretest that caused errors with restarted DFA
+     matches in certain environments (the workspace was not being correctly
+     retained). Also added to pcre_dfa_exec() a simple plausibility check on
+     some of the workspace data at the beginning of a restart.
+. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
+     was not doing so when it should - probably a typo introduced by SVN 528
+     (change 8.10/14).
+. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
+     \w+ when the character tables indicated that \x{c4} was a word character.
+     There were several related cases, all because the tests for doing a table
+     lookup were testing for characters less than 127 instead of 255.
+. If a pattern contains capturing parentheses that are not used in a match,
+     their slots in the ovector are set to -1. For those that are higher than
+     any matched groups, this happens at the end of processing. In the case when
+     there were back references that the ovector was too small to contain
+     (causing temporary malloc'd memory to be used during matching), and the
+     highest capturing number was not used, memory off the end of the ovector
+     was incorrectly being set to -1. (It was using the size of the temporary
+     memory instead of the true size.)
+. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
+     ovector size, it uses memory at the end of the block that it has got.
+. Check for an overlong MARK name and give an error at compile time. The
+     limit is 255 for the 8-bit library and 65535 for the 16-bit library.
+. JIT compiler update.
+. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
+     Rill for the patch.
+. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
+. Variable renamings in the PCRE-JIT compiler. No functionality change.
+. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
+     SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
+     was enabled.
+. Improve JIT code generation for greedy plus quantifier.
+. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
+to "aa" instead of to an empty string. The bug affected repeated groups
+     that could potentially match an empty string.
+. Optimizing single character iterators in JIT.
+. Wide characters specified with \uxxxx in JavaScript mode are now subject to
+     the same checks as \x{...} characters in non-JavaScript mode. Specifically,
+     codepoints that are too big for the mode are faulted, and in a UTF mode,
+     disallowed codepoints are also faulted.
+. If PCRE was compiled with UTF support, in three places in the DFA
+     matcher there was code that should only have been obeyed in UTF mode, but
+     was being obeyed unconditionally. In 8-bit mode this could cause incorrect
+     processing when bytes with values greater than 127 were present. In 16-bit
+     mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
+     both cases the values are those that cannot be the first data item in a UTF
+     character. The three items that might have provoked this were recursions,
+     possessively repeated groups, and atomic groups.
+. Ensure that libpcre is explicitly listed in the link commands for pcretest
+     and pcregrep, because some OS require shared objects to be explicitly
+     passed to ld, causing the link step to fail if they are not.
+. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
+     mode, patterns that started with \h* or \R* might be incorrectly matched.
+ Version 8.30 04-February-2012
+ -----------------------------
+.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
+     name is defined in ctype.h.
+.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
+     only in quite long subpatterns.
+.  Removed the function pcre_info(), which has been obsolete and deprecated
+     since it was replaced by pcre_fullinfo() in February 2000.
+.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
+     match a (*MARK), and the match failed at the start of the subject, a
+     reference to memory before the start of the subject could occur. This bug
+     was introduced by fix 17 of release 8.21.
+.  A reference to an unset group with zero minimum repetition was giving
+     totally wrong answers (in non-JavaScript-compatibility mode). For example,
+     /(another)?(\1?)test/ matched against "hello world test". This bug was
+     introduced in release 8.13.
+.  Add support for 16-bit character strings (a large amount of work involving
+     many changes and refactorings).
+.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
+     command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
+     from a file.
+.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
+     rounding is not applied in this particular case).
+.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
+     if they appear, or are escaped, in patterns.
+. Get rid of a number of -Wunused-but-set-variable warnings.
+. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
+     "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
+     Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
+     also returns the mark "x". This bug applied to capturing parentheses,
+     non-capturing parentheses, and atomic parentheses. It also applied to some
+     assertions.
+. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
+     information out of configure.ac instead of relying on pcre.h.generic, which
+     is not stored in the repository.
+. Applied Dmitry V. Levin's patch for a more portable method for linking with
+     -lreadline.
+. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
+. Applied Graycode's patch to put the top-level frame on the stack rather
+     than the heap when not using the stack for recursion. This gives a
+     performance improvement in many cases when recursion is not deep.
+. Experimental code added to "pcretest -C" to output the stack frame size.
+ Version 8.21 12-Dec-2011
+ ------------------------
+.  Updating the JIT compiler.
+.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
+     are added as well.
+.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
+     PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
+     calling _pcre_jit_exec. Some extra comments are added.
+.  (*MARK) settings inside atomic groups that do not contain any capturing
+     parentheses, for example, (?>a(*:m)), were not being passed out. This bug
+     was introduced by change 18 for 8.20.
+.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
+     ECMA-262 standard.
+.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
+     erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
+     This bug was probably introduced by change 9 of 8.13.
+.  While fixing 6 above, I noticed that a number of other items were being
+     incorrectly rejected as "not fixed length". This arose partly because newer
+     opcodes had not been added to the fixed-length checking code. I have (a)
+     corrected the bug and added tests for these items, and (b) arranged for an
+     error to occur if an unknown opcode is encountered while checking for fixed
+     length instead of just assuming "not fixed length". The items that were
+     rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
+     (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
+     repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
+.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
+     being incorrectly compiled and would have given unpredicatble results.
+.  A possessively repeated subpattern with minimum repeat count greater than
+     one behaved incorrectly. For example, (A){2,}+ behaved as if it was
+     (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
+     the first (A) could occur when it should not.
+. Add a cast and remove a redundant test from the code.
+. JIT should use pcre_malloc/pcre_free for allocation.
+. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
+     best practice nowadays, and helps with cross-compiling. (If the exec_prefix
+     is anything other than /usr, -L is still shown).
+. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
+. Perl does not support \N without a following name in a [] class; PCRE now
+     also gives an error.
+. If a forward reference was repeated with an upper limit of around 2000,
+     it caused the error "internal error: overran compiling workspace". The
+     maximum number of forward references (including repeats) was limited by the
+     internal workspace, and dependent on the LINK_SIZE. The code has been
+     rewritten so that the workspace expands (via pcre_malloc) if necessary, and
+     the default depends on LINK_SIZE. There is a new upper limit (for safety)
+     of around 200,000 forward references. While doing this, I also speeded up
+     the filling in of repeated forward references.
+. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
+     incorrectly expecting the subject to contain another "a" after the start.
+. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
+     in the match, the SKIP should be ignored. This was not happening; instead
+     the SKIP was being treated as NOMATCH. For patterns such as
+     /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
+     tested.
+. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
+     now much more compatible with Perl, in particular in cases where the result
+     is a non-match for a non-anchored pattern. For example, if
+     /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
+     "m", where previously it did not return a name. A side effect of this
+     change is that for partial matches, the last encountered mark name is
+     returned, as for non matches. A number of tests that were previously not
+     Perl-compatible have been moved into the Perl-compatible test files. The
+     refactoring has had the pleasing side effect of removing one argument from
+     the match() function, thus reducing its stack requirements.
+. If the /S+ option was used in pcretest to study a pattern using JIT,
+     subsequent uses of /S (without +) incorrectly behaved like /S+.
+. Retrieve executable code size support for the JIT compiler and fixing
+     some warnings.
+. A caseless match of a UTF-8 character whose other case uses fewer bytes did
+     not work when the shorter character appeared right at the end of the
+     subject string.
+. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
+     systems.
+. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
+     output it when the /M option is used in pcretest.
+. The CheckMan script was not being included in the distribution. Also, added
+     an explicit "perl" to run Perl scripts from the PrepareRelease script
+     because this is reportedly needed in Windows.
+. If study data was being save in a file and studying had not found a set of
+     "starts with" bytes for the pattern, the data written to the file (though
+     never used) was taken from uninitialized memory and so caused valgrind to
+     complain.
+. Updated RunTest.bat as provided by Sheri Pierce.
+. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
+. Computation of memory usage for the table of capturing group names was
+     giving an unnecessarily large value.
+ Version 8.20 21-Oct-2011
+ ------------------------
+.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
+     a POSIX class. After further experiments with Perl, which convinced me that
+     Perl has bugs and confusions, a closing square bracket is no longer allowed
+     in a POSIX name. This bug also affected patterns with classes that started
+     with full stops.
+.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
+     captured substring, but while checking the failing first alternative,
+     substring 1 is temporarily captured. If the output vector supplied to
+     pcre_exec() was not big enough for this capture, the yield of the function
+     was still zero ("insufficient space for captured substrings"). This cannot
+     be totally fixed without adding another stack variable, which seems a lot
+     of expense for a edge case. However, I have improved the situation in cases
+     such as /(a)(b)x|abc/ matched against "abc", where the return code
+     indicates that fewer than the maximum number of slots in the ovector have
+     been set.
+.  Related to (2) above: when there are more back references in a pattern than
+     slots in the output vector, pcre_exec() uses temporary memory during
+     matching, and copies in the captures as far as possible afterwards. It was
+     using the entire output vector, but this conflicts with the specification
+     that only 2/3 is used for passing back captured substrings. Now it uses
+     only the first 2/3, for compatibility. This is, of course, another edge
+     case.
+.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
+     main code base, and can be used by building with --enable-jit. When this is
+     done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
+     runtime --no-jit option is given.
+.  When the number of matches in a pcre_dfa_exec() run exactly filled the
+     ovector, the return from the function was zero, implying that there were
+     other matches that did not fit. The correct "exactly full" value is now
+     returned.
+.  If a subpattern that was called recursively or as a subroutine contained
+     (*PRUNE) or any other control that caused it to give a non-standard return,
+     invalid errors such as "Error -26 (nested recursion at the same subject
+     position)" or even infinite loops could occur.
+.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
+     computing the minimum length on reaching *ACCEPT, and so ended up with the
+     wrong value of 1 rather than 0. Further investigation indicates that
+     computing a minimum subject length in the presence of *ACCEPT is difficult
+     (think back references, subroutine calls), and so I have changed the code
+     so that no minimum is registered for a pattern that contains *ACCEPT.
+.  If (*THEN) was present in the first (true) branch of a conditional group,
+     it was not handled as intended. [But see 16 below.]
+.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
+     Sheri Pierce.
+. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
+     the first byte in a match must be "a".
+. Change 17 for 8.13 increased the recursion depth for patterns like
+     /a(?:.)*?a/ drastically. I've improved things by remembering whether a
+     pattern contains any instances of (*THEN). If it does not, the old
+     optimizations are restored. It would be nice to do this on a per-group
+     basis, but at the moment that is not feasible.
+. In some environments, the output of pcretest -C is CRLF terminated. This
+     broke RunTest's code that checks for the link size. A single white space
+     character after the value is now allowed for.
+. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
+     For "fr", it uses the Windows-specific input and output files.
+. If (*THEN) appeared in a group that was called recursively or as a
+     subroutine, it did not work as intended. [But see next item.]
+. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
+     pattern fragments (but not containing any | characters). If A and B are
+     matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
+     was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
+     D. In other words, Perl considers parentheses that do not contain any |
+     characters to be part of a surrounding alternative, whereas PCRE was
+     treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
+     differently. PCRE now behaves in the same way as Perl, except in the case
+     of subroutine/recursion calls such as (?1) which have in any case always
+     been different (but PCRE had them first :-).
+. Related to 15 above: Perl does not treat the | in a conditional group as
+     creating alternatives. Such a group is treated in the same way as an
+     ordinary group without any | characters when processing (*THEN). PCRE has
+     been changed to match Perl's behaviour.
+. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
+     RunGrepTest script failed.
+. Change 22 for version 13 caused atomic groups to use more stack. This is
+     inevitable for groups that contain captures, but it can lead to a lot of
+     stack use in large patterns. The old behaviour has been restored for atomic
+     groups that do not contain any capturing parentheses.
+. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
+     suppress the check for a minimum subject length at run time. (If it was
+     given to pcre_exec() or pcre_dfa_exec() it did work.)
+. Fixed an ASCII-dependent infelicity in pcretest that would have made it
+     fail to work when decoding hex characters in data strings in EBCDIC
+     environments.
+. It appears that in at least one Mac OS environment, the isxdigit() function
+     is implemented as a macro that evaluates to its argument more than once,
+     contravening the C 90 Standard (I haven't checked a later standard). There
+     was an instance in pcretest which caused it to go wrong when processing
+     \x{...} escapes in subject strings. The has been rewritten to avoid using
+     things like p++ in the argument of isxdigit().
+ Version 8.13 16-Aug-2011
  ------------------------
 .  The Unicode data tables have been updated to Unicode 6.0.0.
-Line 20 
 Version 8.13 30-Apr-2011
+Line 471 
 Version 8.13 30-Apr-2011
      code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
 -byte code at the end of the subject (it thought there wasn't enough data
      left).
 .  Comprehensive information about what went wrong is now returned by
      pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
      as the output vector has at least 2 elements. The offset of the start of
      the failing character and a reason code are placed in the vector.
 .  When the UTF-8 string check fails for pcre_compile(), the offset that is
      now returned is for the first byte of the failing character, instead of the
      last byte inspected. This is an incompatible change, but I hope it is small
      enough not to be a problem. It makes the returned offset consistent with
      pcre_exec() and pcre_dfa_exec().
 .  pcretest now gives a text phrase as well as the error number when
      pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
      failure, the offset and reason code are output.
 .  When \R was used with a maximizing quantifier it failed to skip backwards
      over a \r\n pair if the subsequent match failed. Instead, it just skipped
      back over a single character (\n). This seems wrong (because it treated the
      two characters as a single entity when going forwards), conflicts with the
      documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
      behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
      has been changed.
 .  Some internal refactoring has changed the processing so that the handling
      of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
      time (the PCRE_DOTALL option was changed this way some time ago: version
 .7 change 16). This has made it possible to abolish the OP_OPT op code,
      which was always a bit of a fudge. It also means that there is one less
      argument for the match() function, which reduces its stack requirements
      slightly. This change also fixes an incompatibility with Perl: the pattern
      (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
 . More internal refactoring has drastically reduced the number of recursive
      calls to match() for possessively repeated groups such as (abc)++ when
      using pcre_exec().
 . While implementing 10, a number of bugs in the handling of groups were
      discovered and fixed:
      (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
      (a|)*(?1) gave a compile-time internal error.
      ((a|)+)+  did not notice that the outer group could match an empty string.
      (^a|^)+   was not marked as anchored.
      (.*a|.*)+ was not marked as matching at start or after a newline.
 . Yet more internal refactoring has removed another argument from the match()
      function. Special calls to this function are now indicated by setting a
      value in a variable in the "match data" data block.
 . Be more explicit in pcre_study() instead of relying on "default" for
      opcodes that mean there is no starting character; this means that when new
      ones are added and accidentally left out of pcre_study(), testing should
      pick them up.
 . The -s option of pcretest has been documented for ages as being an old
      synonym of -m (show memory usage). I have changed it to mean "force study
      for every regex", that is, assume /S for every regex. This is similar to -i
      and -d etc. It's slightly incompatible, but I'm hoping nobody is still
      using it. It makes it easier to run collections of tests with and without
      study enabled, and thereby test pcre_study() more easily. All the standard
      tests are now run with and without -s (but some patterns can be marked as
      "never study" - see 20 below).
 . When (*ACCEPT) was used in a subpattern that was called recursively, the
      restoration of the capturing data to the outer values was not happening
      correctly.
 . If a recursively called subpattern ended with (*ACCEPT) and matched an
      empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
      pattern had matched an empty string, and so incorrectly returned a no
      match.
 . There was optimizing code for the last branch of non-capturing parentheses,
      and also for the obeyed branch of a conditional subexpression, which used
-     tail recursion to cut down on stack usage. Unfortunately, not that there is
+     tail recursion to cut down on stack usage. Unfortunately, now that there is
      the possibility of (*THEN) occurring in these branches, tail recursion is
      no longer possible because the return has to be checked for (*THEN). These
-     two optimizations have therefore been removed.
+     two optimizations have therefore been removed. [But see 8.20/11 above.]
 . If a pattern containing \R was studied, it was assumed that \R always
      matched two bytes, thus causing the minimum subject length to be
      incorrectly computed because \R can also match just one byte.
 . If a pattern containing (*ACCEPT) was studied, the minimum subject length
      was incorrectly computed.
-. If /S is present twice on a test pattern in pcretest input, it *disables*
+. If /S is present twice on a test pattern in pcretest input, it now
-     studying, thereby overriding the use of -s on the command line. This is
+     *disables* studying, thereby overriding the use of -s on the command line
-     necessary for one or two tests to keep the output identical in both cases.
+     (see 14 above). This is necessary for one or two tests to keep the output
+     identical in both cases.
 . When (*ACCEPT) was used in an assertion that matched an empty string and
      PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
 . When an atomic group that contained a capturing parenthesis was
      successfully matched, but the branch in which it appeared failed, the
      capturing was not being forgotten if a higher numbered group was later
      captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
      group 1 to "a", when in fact it should be unset. This applied to multi-
      branched capturing and non-capturing groups, repeated or not, and also to
-     positive assertions (capturing in negative assertions is not well defined
+     positive assertions (capturing in negative assertions does not happen
      in PCRE) and also to nested atomic groups.
 . Add the ++ qualifier feature to pcretest, to show the remainder of the
-     subject after a captured substring (to make it easier to tell which of a
+     subject after a captured substring, to make it easier to tell which of a
-     number of identical substrings has been captured).
+     number of identical substrings has been captured.
 . The way atomic groups are processed by pcre_exec() has been changed so that
      if they are repeated, backtracking one repetition now resets captured
      values correctly. For example, if ((?>(a+)b)+aabab) is matched against
      "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
      "aaa". Previously, it would have been "a". As part of this code
      refactoring, the way recursive calls are handled has also been changed.
 . If an assertion condition captured any substrings, they were not passed
      back unless some other capturing happened later. For example, if
      (?(?=(a))a) was matched against "a", no capturing was returned.
 . When studying a pattern that contained subroutine calls or assertions,
      the code for finding the minimum length of a possible match was handling
      direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
      group 1 called group 2 while simultaneously a separate group 2 called group
 ). A stack overflow occurred in this case. I have fixed this by limiting
      the recursion depth to 10.
 . Updated RunTest.bat in the distribution to the version supplied by Tom
      Fortmann. This supports explicit test numbers on the command line, and has
      argument validation and error reporting.
+. An instance of \X with an unlimited repeat could fail if at any point the
+     first character it looked at was a mark character.
+. Some minor code refactoring concerning Unicode properties and scripts
+     should reduce the stack requirement of match() slightly.
+. Added the '=' option to pcretest to check the setting of unused capturing
+     slots at the end of the pattern, which are documented as being -1, but are
+     not included in the return count.
+. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
+     compiled something random. Now it gives a compile-time error (as does
+     Perl).
+. A *MARK encountered during the processing of a positive assertion is now
+     recorded and passed back (compatible with Perl).
+. If --only-matching or --colour was set on a pcregrep call whose pattern
+     had alternative anchored branches, the search for a second match in a line
+     was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
+     matched the line "0102" twice. The same bug affected patterns that started
+     with a backwards assertion. For example /\b01|\b02/ also matched "0102"
+     twice.
+. Previously, PCRE did not allow quantification of assertions. However, Perl
+     does, and because of capturing effects, quantifying parenthesized
+     assertions may at times be useful. Quantifiers are now allowed for
+     parenthesized assertions.
+. A minor code tidy in pcre_compile() when checking options for \R usage.
+. \g was being checked for fancy things in a character class, when it should
+     just be a literal "g".
+. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
+     appearance of a nested POSIX class supersedes an apparent external class.
+     For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
+     unescaped square brackets may also appear as part of class names. For
+     example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
+     more like Perl. (But see 8.20/1 above.)
+. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
+     was because it thought it was \N{name}, which is not supported).
+. Add minix to OS list not supporting the -S option in pcretest.
+. PCRE tries to detect cases of infinite recursion at compile time, but it
+     cannot analyze patterns in sufficient detail to catch mutual recursions
+     such as ((?1))((?2)). There is now a runtime test that gives an error if a
+     subgroup is called recursively as a subpattern for a second time at the
+     same position in the subject string. In previous releases this might have
+     been caught by the recursion limit, or it might have run out of stack.
+. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
+     happen only once. PCRE was, however incorrectly giving a compile time error
+     "recursive call could loop indefinitely" because it cannot analyze the
+     pattern in sufficient detail. The compile time test no longer happens when
+     PCRE is compiling a conditional subpattern, but actual runaway loops are
+     now caught at runtime (see 40 above).
+. It seems that Perl allows any characters other than a closing parenthesis
+     to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
+     has been changed to be the same.
+. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
+     as not to get warnings when autogen.sh is called. Also changed
+     AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
+. To help people who use pcregrep to scan files containing exceedingly long
+     lines, the following changes have been made:
+     (a) The default value of the buffer size parameter has been increased from
+K to 20K. (The actual buffer used is three times this size.)
+     (b) The default can be changed by ./configure --with-pcregrep-bufsize when
+         PCRE is built.
+     (c) A --buffer-size=n option has been added to pcregrep, to allow the size
+         to be set at run time.
+     (d) Numerical values in pcregrep options can be followed by K or M, for
+         example --buffer-size=50K.
+     (e) If a line being scanned overflows pcregrep's buffer, an error is now
+         given and the return code is set to 2.
+. Add a pointer to the latest mark to the callout data block.
+. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
+     partial match of an empty string instead of no match. This was specific to
+     the use of ".".
+. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
+     complete match instead of a partial match. This bug was dependent on both
+     the PCRE_UTF8 and PCRE_DOTALL options being set.
+. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
+     starting byte set, because \b was not being ignored.
  Version 8.12 15-Jan-2011

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