/[pcre]/code/trunk/doc/pcretest.txt
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revision 392 by ph10, Tue Mar 17 21:30:30 2009 UTC revision 567 by ph10, Sat Nov 6 17:10:00 2010 UTC
# Line 154  PATTERN MODIFIERS Line 154  PATTERN MODIFIERS
154    
155           /caseless/i           /caseless/i
156    
157         The following table shows additional modifiers for setting PCRE options         The  following  table  shows additional modifiers for setting PCRE com-
158         that do not correspond to anything in Perl:         pile-time options that do not correspond to anything in Perl:
159    
160             /8              PCRE_UTF8
161             /?              PCRE_NO_UTF8_CHECK
162           /A              PCRE_ANCHORED           /A              PCRE_ANCHORED
163           /C              PCRE_AUTO_CALLOUT           /C              PCRE_AUTO_CALLOUT
164           /E              PCRE_DOLLAR_ENDONLY           /E              PCRE_DOLLAR_ENDONLY
# Line 164  PATTERN MODIFIERS Line 166  PATTERN MODIFIERS
166           /J              PCRE_DUPNAMES           /J              PCRE_DUPNAMES
167           /N              PCRE_NO_AUTO_CAPTURE           /N              PCRE_NO_AUTO_CAPTURE
168           /U              PCRE_UNGREEDY           /U              PCRE_UNGREEDY
169             /W              PCRE_UCP
170           /X              PCRE_EXTRA           /X              PCRE_EXTRA
171           /<JS>           PCRE_JAVASCRIPT_COMPAT           /<JS>           PCRE_JAVASCRIPT_COMPAT
172           /<cr>           PCRE_NEWLINE_CR           /<cr>           PCRE_NEWLINE_CR
# Line 174  PATTERN MODIFIERS Line 177  PATTERN MODIFIERS
177           /<bsr_anycrlf>  PCRE_BSR_ANYCRLF           /<bsr_anycrlf>  PCRE_BSR_ANYCRLF
178           /<bsr_unicode>  PCRE_BSR_UNICODE           /<bsr_unicode>  PCRE_BSR_UNICODE
179    
180         Those specifying line ending sequences are literal  strings  as  shown,         The modifiers that are enclosed in angle brackets are  literal  strings
181         but  the  letters  can  be  in either case. This example sets multiline         as  shown,  including  the  angle  brackets,  but the letters can be in
182         matching with CRLF as the line ending sequence:         either case. This example sets multiline matching with CRLF as the line
183           ending sequence:
184    
185           /^abc/m<crlf>           /^abc/m<crlf>
186    
187         Details of the meanings of these PCRE options are given in the  pcreapi         As well as turning on the PCRE_UTF8 option, the /8 modifier also causes
188         documentation.         any non-printing characters in output strings to be printed  using  the
189           \x{hh...}  notation  if they are valid UTF-8 sequences. Full details of
190           the PCRE options are given in the pcreapi documentation.
191    
192     Finding all matches in a string     Finding all matches in a string
193    
194         Searching  for  all  possible matches within each subject string can be         Searching for all possible matches within each subject  string  can  be
195         requested by the /g or /G modifier. After  finding  a  match,  PCRE  is         requested  by  the  /g  or  /G modifier. After finding a match, PCRE is
196         called again to search the remainder of the subject string. The differ-         called again to search the remainder of the subject string. The differ-
197         ence between /g and /G is that the former uses the startoffset argument         ence between /g and /G is that the former uses the startoffset argument
198         to  pcre_exec()  to  start  searching  at a new point within the entire         to pcre_exec() to start searching at a  new  point  within  the  entire
199         string (which is in effect what Perl does), whereas the  latter  passes         string  (which  is in effect what Perl does), whereas the latter passes
200         over  a  shortened  substring.  This makes a difference to the matching         over a shortened substring. This makes a  difference  to  the  matching
201         process if the pattern begins with a lookbehind assertion (including \b         process if the pattern begins with a lookbehind assertion (including \b
202         or \B).         or \B).
203    
204         If  any  call  to  pcre_exec()  in a /g or /G sequence matches an empty         If any call to pcre_exec() in a /g or  /G  sequence  matches  an  empty
205         string, the next call is done with the PCRE_NOTEMPTY and  PCRE_ANCHORED         string,  the  next  call  is  done  with  the PCRE_NOTEMPTY_ATSTART and
206         flags  set in order to search for another, non-empty, match at the same         PCRE_ANCHORED flags set in order  to  search  for  another,  non-empty,
207         point.  If this second match fails, the start  offset  is  advanced  by         match  at  the same point. If this second match fails, the start offset
208         one,  and  the normal match is retried. This imitates the way Perl han-         is advanced, and the normal match is retried.  This  imitates  the  way
209         dles such cases when using the /g modifier or the split() function.         Perl handles such cases when using the /g modifier or the split() func-
210           tion. Normally, the start offset is advanced by one character,  but  if
211           the  newline  convention  recognizes CRLF as a newline, and the current
212           character is CR followed by LF, an advance of two is used.
213    
214     Other modifiers     Other modifiers
215    
# Line 218  PATTERN MODIFIERS Line 227  PATTERN MODIFIERS
227         feature for use in the automatic test scripts; it ensures that the same         feature for use in the automatic test scripts; it ensures that the same
228         output is generated for different internal link sizes.         output is generated for different internal link sizes.
229    
        The /L modifier must be followed directly by the name of a locale,  for  
        example,  
   
          /pattern/Lfr_FR  
   
        For this reason, it must be the last modifier. The given locale is set,  
        pcre_maketables() is called to build a set of character tables for  the  
        locale,  and  this  is then passed to pcre_compile() when compiling the  
        regular expression. Without an /L  modifier,  NULL  is  passed  as  the  
        tables  pointer; that is, /L applies only to the expression on which it  
        appears.  
   
        The /I modifier requests that pcretest  output  information  about  the  
        compiled  pattern (whether it is anchored, has a fixed first character,  
        and so on). It does this by calling pcre_fullinfo() after  compiling  a  
        pattern.  If  the pattern is studied, the results of that are also out-  
        put.  
   
230         The /D modifier is a PCRE debugging feature, and is equivalent to  /BI,         The /D modifier is a PCRE debugging feature, and is equivalent to  /BI,
231         that is, both the /B and the /I modifiers.         that is, both the /B and the /I modifiers.
232    
# Line 247  PATTERN MODIFIERS Line 238  PATTERN MODIFIERS
238         used, that is, when the /P pattern modifier is specified. See also  the         used, that is, when the /P pattern modifier is specified. See also  the
239         section about saving and reloading compiled patterns below.         section about saving and reloading compiled patterns below.
240    
241         The  /S  modifier causes pcre_study() to be called after the expression         The  /I  modifier  requests  that pcretest output information about the
242         has been compiled, and the results used when the expression is matched.         compiled pattern (whether it is anchored, has a fixed first  character,
243           and  so  on). It does this by calling pcre_fullinfo() after compiling a
244           pattern. If the pattern is studied, the results of that are  also  out-
245           put.
246    
247           The  /K modifier requests pcretest to show names from backtracking con-
248           trol verbs that are returned  from  calls  to  pcre_exec().  It  causes
249           pcretest  to create a pcre_extra block if one has not already been cre-
250           ated by a call to pcre_study(), and to set the PCRE_EXTRA_MARK flag and
251           the mark field within it, every time that pcre_exec() is called. If the
252           variable that the mark field points to is non-NULL for  a  match,  non-
253           match, or partial match, pcretest prints the string to which it points.
254           For a match, this is shown on a line by itself, tagged with "MK:".  For
255           a non-match it is added to the message.
256    
257           The  /L modifier must be followed directly by the name of a locale, for
258           example,
259    
260             /pattern/Lfr_FR
261    
262           For this reason, it must be the last modifier. The given locale is set,
263           pcre_maketables()  is called to build a set of character tables for the
264           locale, and this is then passed to pcre_compile()  when  compiling  the
265           regular  expression.  Without an /L (or /T) modifier, NULL is passed as
266           the tables pointer; that is, /L applies only to the expression on which
267           it appears.
268    
269         The /M modifier causes the size of memory block used to hold  the  com-         The  /M  modifier causes the size of memory block used to hold the com-
270         piled pattern to be output.         piled pattern to be output.
271    
272           The /S modifier causes pcre_study() to be called after  the  expression
273           has been compiled, and the results used when the expression is matched.
274    
275           The  /T  modifier  must be followed by a single digit. It causes a spe-
276           cific set of built-in character tables to be passed to  pcre_compile().
277           It is used in the standard PCRE tests to check behaviour with different
278           character tables. The digit specifies the tables as follows:
279    
280             0   the default ASCII tables, as distributed in
281                   pcre_chartables.c.dist
282             1   a set of tables defining ISO 8859 characters
283    
284           In table 1, some characters whose codes are greater than 128 are  iden-
285           tified as letters, digits, spaces, etc.
286    
287       Using the POSIX wrapper API
288    
289         The  /P modifier causes pcretest to call PCRE via the POSIX wrapper API         The  /P modifier causes pcretest to call PCRE via the POSIX wrapper API
290         rather than its native API. When this  is  done,  all  other  modifiers         rather than its native API. When /P is set, the following modifiers set
291         except  /i,  /m, and /+ are ignored. REG_ICASE is set if /i is present,         options for the regcomp() function:
292         and REG_NEWLINE is set if /m is present. The  wrapper  functions  force  
293         PCRE_DOLLAR_ENDONLY always, and PCRE_DOTALL unless REG_NEWLINE is set.           /i    REG_ICASE
294             /m    REG_NEWLINE
295         The  /8 modifier causes pcretest to call PCRE with the PCRE_UTF8 option           /N    REG_NOSUB
296         set. This turns on support for UTF-8 character handling in  PCRE,  pro-           /s    REG_DOTALL     )
297         vided  that  it  was  compiled with this support enabled. This modifier           /U    REG_UNGREEDY   ) These options are not part of
298         also causes any non-printing characters in output strings to be printed           /W    REG_UCP        )   the POSIX standard
299         using the \x{hh...} notation if they are valid UTF-8 sequences.           /8    REG_UTF8       )
300    
301         If  the  /?  modifier  is  used  with  /8,  it  causes pcretest to call         The  /+  modifier  works  as  described  above. All other modifiers are
302         pcre_compile() with the  PCRE_NO_UTF8_CHECK  option,  to  suppress  the         ignored.
        checking of the string for UTF-8 validity.  
303    
304    
305  DATA LINES  DATA LINES
306    
307         Before  each  data  line is passed to pcre_exec(), leading and trailing         Before each data line is passed to pcre_exec(),  leading  and  trailing
308         whitespace is removed, and it is then scanned for \  escapes.  Some  of         whitespace  is  removed,  and it is then scanned for \ escapes. Some of
309         these  are  pretty esoteric features, intended for checking out some of         these are pretty esoteric features, intended for checking out  some  of
310         the more complicated features of PCRE. If you are just  testing  "ordi-         the  more  complicated features of PCRE. If you are just testing "ordi-
311         nary"  regular  expressions,  you probably don't need any of these. The         nary" regular expressions, you probably don't need any  of  these.  The
312         following escapes are recognized:         following escapes are recognized:
313    
314           \a         alarm (BEL, \x07)           \a         alarm (BEL, \x07)
# Line 323  DATA LINES Line 355  DATA LINES
355           \M         discover the minimum MATCH_LIMIT and           \M         discover the minimum MATCH_LIMIT and
356                        MATCH_LIMIT_RECURSION settings                        MATCH_LIMIT_RECURSION settings
357           \N         pass the PCRE_NOTEMPTY option to pcre_exec()           \N         pass the PCRE_NOTEMPTY option to pcre_exec()
358                        or pcre_dfa_exec()                        or pcre_dfa_exec(); if used twice, pass the
359                          PCRE_NOTEMPTY_ATSTART option
360           \Odd       set the size of the output vector passed to           \Odd       set the size of the output vector passed to
361                        pcre_exec() to dd (any number of digits)                        pcre_exec() to dd (any number of digits)
362           \P         pass the PCRE_PARTIAL option to pcre_exec()           \P         pass the PCRE_PARTIAL_SOFT option to pcre_exec()
363                        or pcre_dfa_exec()                        or pcre_dfa_exec(); if used twice, pass the
364                          PCRE_PARTIAL_HARD option
365           \Qdd       set the PCRE_MATCH_LIMIT_RECURSION limit to dd           \Qdd       set the PCRE_MATCH_LIMIT_RECURSION limit to dd
366                        (any number of digits)                        (any number of digits)
367           \R         pass the PCRE_DFA_RESTART option to pcre_dfa_exec()           \R         pass the PCRE_DFA_RESTART option to pcre_dfa_exec()
368           \S         output details of memory get/free calls during matching           \S         output details of memory get/free calls during matching
369             \Y         pass the PCRE_NO_START_OPTIMIZE option to pcre_exec()
370                          or pcre_dfa_exec()
371           \Z         pass the PCRE_NOTEOL option to pcre_exec()           \Z         pass the PCRE_NOTEOL option to pcre_exec()
372                        or pcre_dfa_exec()                        or pcre_dfa_exec()
373           \?         pass the PCRE_NO_UTF8_CHECK option to           \?         pass the PCRE_NO_UTF8_CHECK option to
374                        pcre_exec() or pcre_dfa_exec()                        pcre_exec() or pcre_dfa_exec()
375           \>dd       start the match at offset dd (any number of digits);           \>dd       start the match at offset dd (optional "-"; then
376                        this sets the startoffset argument for pcre_exec()                        any number of digits); this sets the startoffset
377                        or pcre_dfa_exec()                        argument for pcre_exec() or pcre_dfa_exec()
378           \<cr>      pass the PCRE_NEWLINE_CR option to pcre_exec()           \<cr>      pass the PCRE_NEWLINE_CR option to pcre_exec()
379                        or pcre_dfa_exec()                        or pcre_dfa_exec()
380           \<lf>      pass the PCRE_NEWLINE_LF option to pcre_exec()           \<lf>      pass the PCRE_NEWLINE_LF option to pcre_exec()
# Line 350  DATA LINES Line 386  DATA LINES
386           \<any>     pass the PCRE_NEWLINE_ANY option to pcre_exec()           \<any>     pass the PCRE_NEWLINE_ANY option to pcre_exec()
387                        or pcre_dfa_exec()                        or pcre_dfa_exec()
388    
389         The escapes that specify line ending  sequences  are  literal  strings,         The  escapes  that  specify  line ending sequences are literal strings,
390         exactly as shown. No more than one newline setting should be present in         exactly as shown. No more than one newline setting should be present in
391         any data line.         any data line.
392    
393         A backslash followed by anything else just escapes the  anything  else.         A  backslash  followed by anything else just escapes the anything else.
394         If  the very last character is a backslash, it is ignored. This gives a         If the very last character is a backslash, it is ignored. This gives  a
395         way of passing an empty line as data, since a real  empty  line  termi-         way  of  passing  an empty line as data, since a real empty line termi-
396         nates the data input.         nates the data input.
397    
398         If  \M  is present, pcretest calls pcre_exec() several times, with dif-         If \M is present, pcretest calls pcre_exec() several times,  with  dif-
399         ferent values in the match_limit and  match_limit_recursion  fields  of         ferent  values  in  the match_limit and match_limit_recursion fields of
400         the  pcre_extra  data structure, until it finds the minimum numbers for         the pcre_extra data structure, until it finds the minimum  numbers  for
401         each parameter that allow pcre_exec() to complete. The match_limit num-         each parameter that allow pcre_exec() to complete. The match_limit num-
402         ber  is  a  measure of the amount of backtracking that takes place, and         ber is a measure of the amount of backtracking that  takes  place,  and
403         checking it out can be instructive. For most simple matches, the number         checking it out can be instructive. For most simple matches, the number
404         is  quite  small,  but for patterns with very large numbers of matching         is quite small, but for patterns with very large  numbers  of  matching
405         possibilities, it can become large very quickly with increasing  length         possibilities,  it can become large very quickly with increasing length
406         of subject string. The match_limit_recursion number is a measure of how         of subject string. The match_limit_recursion number is a measure of how
407         much stack (or, if PCRE is compiled with  NO_RECURSE,  how  much  heap)         much  stack  (or,  if  PCRE is compiled with NO_RECURSE, how much heap)
408         memory is needed to complete the match attempt.         memory is needed to complete the match attempt.
409    
410         When  \O  is  used, the value specified may be higher or lower than the         When \O is used, the value specified may be higher or  lower  than  the
411         size set by the -O command line option (or defaulted to 45); \O applies         size set by the -O command line option (or defaulted to 45); \O applies
412         only to the call of pcre_exec() for the line in which it appears.         only to the call of pcre_exec() for the line in which it appears.
413    
414         If  the /P modifier was present on the pattern, causing the POSIX wrap-         If the /P modifier was present on the pattern, causing the POSIX  wrap-
415         per API to be used, the only option-setting  sequences  that  have  any         per  API  to  be  used, the only option-setting sequences that have any
416         effect  are \B and \Z, causing REG_NOTBOL and REG_NOTEOL, respectively,         effect are \B,  \N,  and  \Z,  causing  REG_NOTBOL,  REG_NOTEMPTY,  and
417         to be passed to regexec().         REG_NOTEOL, respectively, to be passed to regexec().
418    
419         The use of \x{hh...} to represent UTF-8 characters is not dependent  on         The  use of \x{hh...} to represent UTF-8 characters is not dependent on
420         the  use  of  the  /8 modifier on the pattern. It is recognized always.         the use of the /8 modifier on the pattern.  It  is  recognized  always.
421         There may be any number of hexadecimal digits inside  the  braces.  The         There  may  be  any number of hexadecimal digits inside the braces. The
422         result  is  from  one  to  six bytes, encoded according to the original         result is from one to six bytes,  encoded  according  to  the  original
423         UTF-8 rules of RFC 2279. This allows for  values  in  the  range  0  to         UTF-8  rules  of  RFC  2279.  This  allows for values in the range 0 to
424         0x7FFFFFFF.  Note  that not all of those are valid Unicode code points,         0x7FFFFFFF. Note that not all of those are valid Unicode  code  points,
425         or indeed valid UTF-8 characters according to the later  rules  in  RFC         or  indeed  valid  UTF-8 characters according to the later rules in RFC
426         3629.         3629.
427    
428    
429  THE ALTERNATIVE MATCHING FUNCTION  THE ALTERNATIVE MATCHING FUNCTION
430    
431         By   default,  pcretest  uses  the  standard  PCRE  matching  function,         By  default,  pcretest  uses  the  standard  PCRE  matching   function,
432         pcre_exec() to match each data line. From release 6.0, PCRE supports an         pcre_exec() to match each data line. From release 6.0, PCRE supports an
433         alternative  matching  function,  pcre_dfa_test(),  which operates in a         alternative matching function, pcre_dfa_test(),  which  operates  in  a
434         different way, and has some restrictions. The differences  between  the         different  way,  and has some restrictions. The differences between the
435         two functions are described in the pcrematching documentation.         two functions are described in the pcrematching documentation.
436    
437         If  a data line contains the \D escape sequence, or if the command line         If a data line contains the \D escape sequence, or if the command  line
438         contains the -dfa option, the alternative matching function is  called.         contains  the -dfa option, the alternative matching function is called.
439         This function finds all possible matches at a given point. If, however,         This function finds all possible matches at a given point. If, however,
440         the \F escape sequence is present in the data line, it stops after  the         the  \F escape sequence is present in the data line, it stops after the
441         first match is found. This is always the shortest possible match.         first match is found. This is always the shortest possible match.
442    
443    
444  DEFAULT OUTPUT FROM PCRETEST  DEFAULT OUTPUT FROM PCRETEST
445    
446         This  section  describes  the output when the normal matching function,         This section describes the output when the  normal  matching  function,
447         pcre_exec(), is being used.         pcre_exec(), is being used.
448    
449         When a match succeeds, pcretest outputs the list of captured substrings         When a match succeeds, pcretest outputs the list of captured substrings
450         that  pcre_exec()  returns,  starting with number 0 for the string that         that pcre_exec() returns, starting with number 0 for  the  string  that
451         matched the whole pattern. Otherwise, it outputs "No match" or "Partial         matched  the  whole  pattern. Otherwise, it outputs "No match" when the
452         match"  when  pcre_exec() returns PCRE_ERROR_NOMATCH or PCRE_ERROR_PAR-         return is PCRE_ERROR_NOMATCH, and "Partial match:" followed by the par-
453         TIAL, respectively, and otherwise the PCRE negative error number.  Here         tially  matching substring when pcre_exec() returns PCRE_ERROR_PARTIAL.
454         is an example of an interactive pcretest run.         (Note that this is the entire substring that was inspected  during  the
455           partial  match; it may include characters before the actual match start
456           if a lookbehind assertion, \K, \b, or \B was involved.) For  any  other
457           returns,  it outputs the PCRE negative error number. Here is an example
458           of an interactive pcretest run.
459    
460           $ pcretest           $ pcretest
461           PCRE version 7.0 30-Nov-2006           PCRE version 7.0 30-Nov-2006
# Line 427  DEFAULT OUTPUT FROM PCRETEST Line 467  DEFAULT OUTPUT FROM PCRETEST
467           data> xyz           data> xyz
468           No match           No match
469    
470         Note  that unset capturing substrings that are not followed by one that         Note that unset capturing substrings that are not followed by one  that
471         is set are not returned by pcre_exec(), and are not shown by  pcretest.         is  set are not returned by pcre_exec(), and are not shown by pcretest.
472         In  the following example, there are two capturing substrings, but when         In the following example, there are two capturing substrings, but  when
473         the first data line is matched, the  second,  unset  substring  is  not         the  first  data  line  is  matched, the second, unset substring is not
474         shown.  An "internal" unset substring is shown as "<unset>", as for the         shown. An "internal" unset substring is shown as "<unset>", as for  the
475         second data line.         second data line.
476    
477             re> /(a)|(b)/             re> /(a)|(b)/
# Line 443  DEFAULT OUTPUT FROM PCRETEST Line 483  DEFAULT OUTPUT FROM PCRETEST
483            1: <unset>            1: <unset>
484            2: b            2: b
485    
486         If the strings contain any non-printing characters, they are output  as         If  the strings contain any non-printing characters, they are output as
487         \0x  escapes,  or  as \x{...} escapes if the /8 modifier was present on         \0x escapes, or as \x{...} escapes if the /8 modifier  was  present  on
488         the pattern. See below for the definition of  non-printing  characters.         the  pattern.  See below for the definition of non-printing characters.
489         If  the pattern has the /+ modifier, the output for substring 0 is fol-         If the pattern has the /+ modifier, the output for substring 0 is  fol-
490         lowed by the the rest of the subject string, identified  by  "0+"  like         lowed  by  the  the rest of the subject string, identified by "0+" like
491         this:         this:
492    
493             re> /cat/+             re> /cat/+
# Line 455  DEFAULT OUTPUT FROM PCRETEST Line 495  DEFAULT OUTPUT FROM PCRETEST
495            0: cat            0: cat
496            0+ aract            0+ aract
497    
498         If  the  pattern  has  the /g or /G modifier, the results of successive         If the pattern has the /g or /G modifier,  the  results  of  successive
499         matching attempts are output in sequence, like this:         matching attempts are output in sequence, like this:
500    
501             re> /\Bi(\w\w)/g             re> /\Bi(\w\w)/g
# Line 469  DEFAULT OUTPUT FROM PCRETEST Line 509  DEFAULT OUTPUT FROM PCRETEST
509    
510         "No match" is output only if the first match attempt fails.         "No match" is output only if the first match attempt fails.
511    
512         If any of the sequences \C, \G, or \L are present in a data  line  that         If  any  of the sequences \C, \G, or \L are present in a data line that
513         is  successfully  matched,  the substrings extracted by the convenience         is successfully matched, the substrings extracted  by  the  convenience
514         functions are output with C, G, or L after the string number instead of         functions are output with C, G, or L after the string number instead of
515         a colon. This is in addition to the normal full list. The string length         a colon. This is in addition to the normal full list. The string length
516         (that is, the return from the extraction function) is given  in  paren-         (that  is,  the return from the extraction function) is given in paren-
517         theses after each string for \C and \G.         theses after each string for \C and \G.
518    
519         Note that whereas patterns can be continued over several lines (a plain         Note that whereas patterns can be continued over several lines (a plain
520         ">" prompt is used for continuations), data lines may not. However new-         ">" prompt is used for continuations), data lines may not. However new-
521         lines  can  be included in data by means of the \n escape (or \r, \r\n,         lines can be included in data by means of the \n escape (or  \r,  \r\n,
522         etc., depending on the newline sequence setting).         etc., depending on the newline sequence setting).
523    
524    
525  OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION  OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION
526    
527         When the alternative matching function, pcre_dfa_exec(),  is  used  (by         When  the  alternative  matching function, pcre_dfa_exec(), is used (by
528         means  of  the \D escape sequence or the -dfa command line option), the         means of the \D escape sequence or the -dfa command line  option),  the
529         output consists of a list of all the matches that start  at  the  first         output  consists  of  a list of all the matches that start at the first
530         point in the subject where there is at least one match. For example:         point in the subject where there is at least one match. For example:
531    
532             re> /(tang|tangerine|tan)/             re> /(tang|tangerine|tan)/
# Line 495  OUTPUT FROM THE ALTERNATIVE MATCHING FUN Line 535  OUTPUT FROM THE ALTERNATIVE MATCHING FUN
535            1: tang            1: tang
536            2: tan            2: tan
537    
538         (Using  the  normal  matching function on this data finds only "tang".)         (Using the normal matching function on this data  finds  only  "tang".)
539         The longest matching string is always given first (and numbered zero).         The  longest matching string is always given first (and numbered zero).
540           After a PCRE_ERROR_PARTIAL return, the output is "Partial match:", fol-
541           lowed  by  the  partially  matching  substring.  (Note that this is the
542           entire substring that was inspected during the partial  match;  it  may
543           include characters before the actual match start if a lookbehind asser-
544           tion, \K, \b, or \B was involved.)
545    
546         If /g is present on the pattern, the search for further matches resumes         If /g is present on the pattern, the search for further matches resumes
547         at the end of the longest match. For example:         at the end of the longest match. For example:
# Line 655  AUTHOR Line 700  AUTHOR
700    
701  REVISION  REVISION
702    
703         Last updated: 10 March 2009         Last updated: 06 November 2010
704         Copyright (c) 1997-2009 University of Cambridge.         Copyright (c) 1997-2010 University of Cambridge.

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