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Revision 1470 - (show annotations)
Fri Apr 4 13:41:58 2014 UTC (5 years, 7 months ago) by ph10
File size: 27924 byte(s)
Final tidies for 8.35 release.
1 News about PCRE releases
2 ------------------------
4 Release 8.35 04-April-2014
5 --------------------------
7 There have been performance improvements for classes containing non-ASCII
8 characters and the "auto-possessification" feature has been extended. Other
9 minor improvements have been implemented and bugs fixed. There is a new callout
10 feature to enable applications to do detailed stack checks at compile time, to
11 avoid running out of stack for deeply nested parentheses. The JIT compiler has
12 been extended with experimental support for ARM-64, MIPS-64, and PPC-LE.
15 Release 8.34 15-December-2013
16 -----------------------------
18 As well as fixing the inevitable bugs, performance has been improved by
19 refactoring and extending the amount of "auto-possessification" that PCRE does.
20 Other notable changes:
22 . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
23 an empty string. If it can, pcretest shows this in its information output.
25 . A back reference to a named subpattern when there is more than one of the
26 same name now checks them in the order in which they appear in the pattern.
27 The first one that is set is used for the reference. Previously only the
28 first one was inspected. This change makes PCRE more compatible with Perl.
30 . Unicode character properties were updated from Unicode 6.3.0.
32 . The character VT has been added to the set of characters that match \s and
33 are generally treated as white space, following this same change in Perl
34 5.18. There is now no difference between "Perl space" and "POSIX space".
36 . Perl has changed its handling of \8 and \9. If there is no previously
37 encountered capturing group of those numbers, they are treated as the
38 literal characters 8 and 9 instead of a binary zero followed by the
39 literals. PCRE now does the same.
41 . Following Perl, added \o{} to specify codepoints in octal, making it
42 possible to specify values greater than 0777 and also making them
43 unambiguous.
45 . In UCP mode, \s was not matching two of the characters that Perl matches,
46 namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
47 were matched by \h.
49 . Add JIT support for the 64 bit TileGX architecture.
51 . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
52 [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
53 does in Unicode mode.
55 . Perl no longer allows group names to start with digits, so I have made this
56 change also in PCRE.
58 . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
59 mean "start of word" and "end of word", respectively, as a transition aid.
62 Release 8.33 28-May-2013
63 --------------------------
65 A number of bugs are fixed, and some performance improvements have been made.
66 There are also some new features, of which these are the most important:
68 . The behaviour of the backtracking verbs has been rationalized and
69 documented in more detail.
71 . JIT now supports callouts and all of the backtracking verbs.
73 . Unicode validation has been updated in the light of Unicode Corrigendum #9,
74 which points out that "non characters" are not "characters that may not
75 appear in Unicode strings" but rather "characters that are reserved for
76 internal use and have only local meaning".
78 . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
79 creator of a pattern can specify lower (but not higher) limits for the
80 matching process.
82 . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
83 the (*UTF) feature, as this could be a security issue.
86 Release 8.32 30-November-2012
87 -----------------------------
89 This release fixes a number of bugs, but also has some new features. These are
90 the highlights:
92 . There is now support for 32-bit character strings and UTF-32. Like the
93 16-bit support, this is done by compiling a separate 32-bit library.
95 . \X now matches a Unicode extended grapheme cluster.
97 . Case-independent matching of Unicode characters that have more than one
98 "other case" now makes all three (or more) characters equivalent. This
99 applies, for example, to Greek Sigma, which has two lowercase versions.
101 . Unicode character properties are updated to Unicode 6.2.0.
103 . The EBCDIC support, which had decayed, has had a spring clean.
105 . A number of JIT optimizations have been added, which give faster JIT
106 execution speed. In addition, a new direct interface to JIT execution is
107 available. This bypasses some of the sanity checks of pcre_exec() to give a
108 noticeable speed-up.
110 . A number of issues in pcregrep have been fixed, making it more compatible
111 with GNU grep. In particular, --exclude and --include (and variants) apply
112 to all files now, not just those obtained from scanning a directory
113 recursively. In Windows environments, the default action for directories is
114 now "skip" instead of "read" (which provokes an error).
116 . If the --only-matching (-o) option in pcregrep is specified multiple
117 times, each one causes appropriate output. For example, -o1 -o2 outputs the
118 substrings matched by the 1st and 2nd capturing parentheses. A separating
119 string can be specified by --om-separator (default empty).
121 . When PCRE is built via Autotools using a version of gcc that has the
122 "visibility" feature, it is used to hide internal library functions that are
123 not part of the public API.
126 Release 8.31 06-July-2012
127 -------------------------
129 This is mainly a bug-fixing release, with a small number of developments:
131 . The JIT compiler now supports partial matching and the (*MARK) and
132 (*COMMIT) verbs.
134 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
135 pattern.
137 . There should be a performance improvement when using the heap instead of the
138 stack for recursion.
140 . pcregrep can now be linked with libedit as an alternative to libreadline.
142 . pcregrep now has a --file-list option where the list of files to scan is
143 given as a file.
145 . pcregrep now recognizes binary files and there are related options.
147 . The Unicode tables have been updated to 6.1.0.
149 As always, the full list of changes is in the ChangeLog file.
152 Release 8.30 04-February-2012
153 -----------------------------
155 Release 8.30 introduces a major new feature: support for 16-bit character
156 strings, compiled as a separate library. There are a few changes to the
157 8-bit library, in addition to some bug fixes.
159 . The pcre_info() function, which has been obsolete for over 10 years, has
160 been removed.
162 . When a compiled pattern was saved to a file and later reloaded on a host
163 with different endianness, PCRE used automatically to swap the bytes in some
164 of the data fields. With the advent of the 16-bit library, where more of this
165 swapping is needed, it is no longer done automatically. Instead, the bad
166 endianness is detected and a specific error is given. The user can then call
167 a new function called pcre_pattern_to_host_byte_order() (or an equivalent
168 16-bit function) to do the swap.
170 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
171 code points and are now faulted. (They are the so-called "surrogates"
172 that are reserved for coding high values in UTF-16.)
175 Release 8.21 12-Dec-2011
176 ------------------------
178 This is almost entirely a bug-fix release. The only new feature is the ability
179 to obtain the size of the memory used by the JIT compiler.
182 Release 8.20 21-Oct-2011
183 ------------------------
185 The main change in this release is the inclusion of Zoltan Herczeg's
186 just-in-time compiler support, which can be accessed by building PCRE with
187 --enable-jit. Large performance benefits can be had in many situations. 8.20
188 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
189 a number of infelicities and differences from Perl.
192 Release 8.13 16-Aug-2011
193 ------------------------
195 This is mainly a bug-fix release. There has been a lot of internal refactoring.
196 The Unicode tables have been updated. The only new feature in the library is
197 the passing of *MARK information to callouts. Some additions have been made to
198 pcretest to make testing easier and more comprehensive. There is a new option
199 for pcregrep to adjust its internal buffer size.
202 Release 8.12 15-Jan-2011
203 ------------------------
205 This release fixes some bugs in pcregrep, one of which caused the tests to fail
206 on 64-bit big-endian systems. There are no changes to the code of the library.
209 Release 8.11 10-Dec-2010
210 ------------------------
212 A number of bugs in the library and in pcregrep have been fixed. As always, see
213 ChangeLog for details. The following are the non-bug-fix changes:
215 . Added --match-limit and --recursion-limit to pcregrep.
217 . Added an optional parentheses number to the -o and --only-matching options
218 of pcregrep.
220 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
221 \B.
223 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
224 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
226 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
227 START_OPTIMIZE option, which is now allowed at compile time
230 Release 8.10 25-Jun-2010
231 ------------------------
233 There are two major additions: support for (*MARK) and friends, and the option
234 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
235 opposites) so that they make use of Unicode properties. There are also a number
236 of lesser new features, and several bugs have been fixed. A new option,
237 --line-buffered, has been added to pcregrep, for use when it is connected to
238 pipes.
241 Release 8.02 19-Mar-2010
242 ------------------------
244 Another bug-fix release.
247 Release 8.01 19-Jan-2010
248 ------------------------
250 This is a bug-fix release. Several bugs in the code itself and some bugs and
251 infelicities in the build system have been fixed.
254 Release 8.00 19-Oct-09
255 ----------------------
257 Bugs have been fixed in the library and in pcregrep. There are also some
258 enhancements. Restrictions on patterns used for partial matching have been
259 removed, extra information is given for partial matches, the partial matching
260 process has been improved, and an option to make a partial match override a
261 full match is available. The "study" process has been enhanced by finding a
262 lower bound matching length. Groups with duplicate numbers may now have
263 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
264 different names. The documentation has been revised to reflect these changes.
265 The version number has been expanded to 3 digits as it is clear that the rate
266 of change is not slowing down.
269 Release 7.9 11-Apr-09
270 ---------------------
272 Mostly bugfixes and tidies with just a couple of minor functional additions.
275 Release 7.8 05-Sep-08
276 ---------------------
278 More bug fixes, plus a performance improvement in Unicode character property
279 lookup.
282 Release 7.7 07-May-08
283 ---------------------
285 This is once again mainly a bug-fix release, but there are a couple of new
286 features.
289 Release 7.6 28-Jan-08
290 ---------------------
292 The main reason for having this release so soon after 7.5 is because it fixes a
293 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
294 addition, the CMake configuration files have been brought up to date.
297 Release 7.5 10-Jan-08
298 ---------------------
300 This is mainly a bug-fix release. However the ability to link pcregrep with
301 libz or libbz2 and the ability to link pcretest with libreadline have been
302 added. Also the --line-offsets and --file-offsets options were added to
303 pcregrep.
306 Release 7.4 21-Sep-07
307 ---------------------
309 The only change of specification is the addition of options to control whether
310 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
311 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
312 relocations needed in a shared library. There have also been some documentation
313 updates, in particular, some more information about using CMake to build PCRE
314 has been added to the NON-UNIX-USE file.
317 Release 7.3 28-Aug-07
318 ---------------------
320 Most changes are bug fixes. Some that are not:
322 1. There is some support for Perl 5.10's experimental "backtracking control
323 verbs" such as (*PRUNE).
325 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
326 restrictive in the strings it accepts.
328 3. Checking for potential integer overflow has been made more dynamic, and as a
329 consequence there is no longer a hard limit on the size of a subpattern that
330 has a limited repeat count.
332 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
333 no longer advance by two characters instead of one when an unanchored match
334 fails at CRLF if there are explicit CR or LF matches within the pattern.
335 This gets rid of some anomalous effects that previously occurred.
337 5. Some PCRE-specific settings for varying the newline options at the start of
338 a pattern have been added.
341 Release 7.2 19-Jun-07
342 ---------------------
344 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
345 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
346 and \V).
348 Correction to the notes for 7.1: the note about shared libraries for Windows is
349 wrong. Previously, three libraries were built, but each could function
350 independently. For example, the pcreposix library also included all the
351 functions from the basic pcre library. The change is that the three libraries
352 are no longer independent. They are like the Unix libraries. To use the
353 pcreposix functions, for example, you need to link with both the pcreposix and
354 the basic pcre library.
356 Some more features from Perl 5.10 have been added:
358 (?-n) and (?+n) relative references for recursion and subroutines.
360 (?(-n) and (?(+n) relative references as conditions.
362 \k{name} and \g{name} are synonyms for \k<name>.
364 \K to reset the start of the matched string; for example, (foo)\Kbar
365 matches bar preceded by foo, but only sets bar as the matched string.
367 (?| introduces a group where the capturing parentheses in each alternative
368 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
369 parentheses number 1 in both cases.
371 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
374 Release 7.1 24-Apr-07
375 ---------------------
377 There is only one new feature in this release: a linebreak setting of
378 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
379 recognizes only CRLF, CR, and LF as linebreaks.
381 A few bugs are fixed (see ChangeLog for details), but the major change is a
382 complete re-implementation of the build system. This now has full Autotools
383 support and so is now "standard" in some sense. It should help with compiling
384 PCRE in a wide variety of environments.
386 NOTE: when building shared libraries for Windows, three dlls are now built,
387 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
388 included in a single dll.
390 Another important change is that the dftables auxiliary program is no longer
391 compiled and run at "make" time by default. Instead, a default set of character
392 tables (assuming ASCII coding) is used. If you want to use dftables to generate
393 the character tables as previously, add --enable-rebuild-chartables to the
394 "configure" command. You must do this if you are compiling PCRE to run on a
395 system that uses EBCDIC code.
397 There is a discussion about character tables in the README file. The default is
398 not to use dftables so that that there is no problem when cross-compiling.
401 Release 7.0 19-Dec-06
402 ---------------------
404 This release has a new major number because there have been some internal
405 upheavals to facilitate the addition of new optimizations and other facilities,
406 and to make subsequent maintenance and extension easier. Compilation is likely
407 to be a bit slower, but there should be no major effect on runtime performance.
408 Previously compiled patterns are NOT upwards compatible with this release. If
409 you have saved compiled patterns from a previous release, you will have to
410 re-compile them. Important changes that are visible to users are:
412 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
413 some more scripts.
415 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
416 sequence as a newline.
418 3. The \R escape matches a single Unicode newline sequence as a single unit.
420 4. New features that will appear in Perl 5.10 are now in PCRE. These include
421 alternative Perl syntax for named parentheses, and Perl syntax for
422 recursion.
424 5. The C++ wrapper interface has been extended by the addition of a
425 QuoteMeta function and the ability to allow copy construction and
426 assignment.
428 For a complete list of changes, see the ChangeLog file.
431 Release 6.7 04-Jul-06
432 ---------------------
434 The main additions to this release are the ability to use the same name for
435 multiple sets of parentheses, and support for CRLF line endings in both the
436 library and pcregrep (and in pcretest for testing).
438 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
439 significantly reduced for certain subject strings.
442 Release 6.5 01-Feb-06
443 ---------------------
445 Important changes in this release:
447 1. A number of new features have been added to pcregrep.
449 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
450 supported properties have been extended with script names such as "Arabic",
451 and the derived properties "Any" and "L&". This has necessitated a change to
452 the interal format of compiled patterns. Any saved compiled patterns that
453 use \p or \P must be recompiled.
455 3. The specification of recursion in patterns has been changed so that all
456 recursive subpatterns are automatically treated as atomic groups. Thus, for
457 example, (?R) is treated as if it were (?>(?R)). This is necessary because
458 otherwise there are situations where recursion does not work.
460 See the ChangeLog for a complete list of changes, which include a number of bug
461 fixes and tidies.
464 Release 6.0 07-Jun-05
465 ---------------------
467 The release number has been increased to 6.0 because of the addition of several
468 major new pieces of functionality.
470 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
471 algorithm, has been added. This has a number of advantages for certain cases,
472 though it does run more slowly, and lacks the ability to capture substrings. On
473 the other hand, it does find all matches, not just the first, and it works
474 better for partial matching. The pcrematching man page discusses the
475 differences.
477 The pcretest program has been enhanced so that it can make use of the new
478 pcre_dfa_exec() matching function and the extra features it provides.
480 The distribution now includes a C++ wrapper library. This is built
481 automatically if a C++ compiler is found. The pcrecpp man page discusses this
482 interface.
484 The code itself has been re-organized into many more files, one for each
485 function, so it no longer requires everything to be linked in when static
486 linkage is used. As a consequence, some internal functions have had to have
487 their names exposed. These functions all have names starting with _pcre_. They
488 are undocumented, and are not intended for use by outside callers.
490 The pcregrep program has been enhanced with new functionality such as
491 multiline-matching and options for output more matching context. See the
492 ChangeLog for a complete list of changes to the library and the utility
493 programs.
496 Release 5.0 13-Sep-04
497 ---------------------
499 The licence under which PCRE is released has been changed to the more
500 conventional "BSD" licence.
502 In the code, some bugs have been fixed, and there are also some major changes
503 in this release (which is why I've increased the number to 5.0). Some changes
504 are internal rearrangements, and some provide a number of new facilities. The
505 new features are:
507 1. There's an "automatic callout" feature that inserts callouts before every
508 item in the regex, and there's a new callout field that gives the position
509 in the pattern - useful for debugging and tracing.
511 2. The extra_data structure can now be used to pass in a set of character
512 tables at exec time. This is useful if compiled regex are saved and re-used
513 at a later time when the tables may not be at the same address. If the
514 default internal tables are used, the pointer saved with the compiled
515 pattern is now set to NULL, which means that you don't need to do anything
516 special unless you are using custom tables.
518 3. It is possible, with some restrictions on the content of the regex, to
519 request "partial" matching. A special return code is given if all of the
520 subject string matched part of the regex. This could be useful for testing
521 an input field as it is being typed.
523 4. There is now some optional support for Unicode character properties, which
524 means that the patterns items such as \p{Lu} and \X can now be used. Only
525 the general category properties are supported. If PCRE is compiled with this
526 support, an additional 90K data structure is include, which increases the
527 size of the library dramatically.
529 5. There is support for saving compiled patterns and re-using them later.
531 6. There is support for running regular expressions that were compiled on a
532 different host with the opposite endianness.
534 7. The pcretest program has been extended to accommodate the new features.
536 The main internal rearrangement is that sequences of literal characters are no
537 longer handled as strings. Instead, each character is handled on its own. This
538 makes some UTF-8 handling easier, and makes the support of partial matching
539 possible. Compiled patterns containing long literal strings will be larger as a
540 result of this change; I hope that performance will not be much affected.
543 Release 4.5 01-Dec-03
544 ---------------------
546 Again mainly a bug-fix and tidying release, with only a couple of new features:
548 1. It's possible now to compile PCRE so that it does not use recursive
549 function calls when matching. Instead it gets memory from the heap. This slows
550 things down, but may be necessary on systems with limited stacks.
552 2. UTF-8 string checking has been tightened to reject overlong sequences and to
553 check that a starting offset points to the start of a character. Failure of the
554 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
556 3. PCRE can now be compiled for systems that use EBCDIC code.
559 Release 4.4 21-Aug-03
560 ---------------------
562 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
563 checks UTF-8 strings for validity by default. There is an option to suppress
564 this, just in case anybody wants that teeny extra bit of performance.
567 Releases 4.1 - 4.3
568 ------------------
570 Sorry, I forgot about updating the NEWS file for these releases. Please take a
571 look at ChangeLog.
574 Release 4.0 17-Feb-03
575 ---------------------
577 There have been a lot of changes for the 4.0 release, adding additional
578 functionality and mending bugs. Below is a list of the highlights of the new
579 functionality. For full details of these features, please consult the
580 documentation. For a complete list of changes, see the ChangeLog file.
582 1. Support for Perl's \Q...\E escapes.
584 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
585 package. They provide some syntactic sugar for simple cases of "atomic
586 grouping".
588 3. Support for the \G assertion. It is true when the current matching position
589 is at the start point of the match.
591 4. A new feature that provides some of the functionality that Perl provides
592 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
593 is for the caller to provide an optional function, by setting pcre_callout to
594 its entry point. To get the function called, the regex must include (?C) at
595 appropriate points.
597 5. Support for recursive calls to individual subpatterns. This makes it really
598 easy to get totally confused.
600 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
601 name a group.
603 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
604 option for pcregrep to make it operate in UTF-8 mode.
606 8. The single man page has been split into a number of separate man pages.
607 These also give rise to individual HTML pages which are put in a separate
608 directory. There is an index.html page that lists them all. Some hyperlinking
609 between the pages has been installed.
612 Release 3.5 15-Aug-01
613 ---------------------
615 1. The configuring system has been upgraded to use later versions of autoconf
616 and libtool. By default it builds both a shared and a static library if the OS
617 supports it. You can use --disable-shared or --disable-static on the configure
618 command if you want only one of them.
620 2. The pcretest utility is now installed along with pcregrep because it is
621 useful for users (to test regexs) and by doing this, it automatically gets
622 relinked by libtool. The documentation has been turned into a man page, so
623 there are now .1, .txt, and .html versions in /doc.
625 3. Upgrades to pcregrep:
626 (i) Added long-form option names like gnu grep.
627 (ii) Added --help to list all options with an explanatory phrase.
628 (iii) Added -r, --recursive to recurse into sub-directories.
629 (iv) Added -f, --file to read patterns from a file.
631 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
632 script, to force use of CR or LF instead of \n in the source. On non-Unix
633 systems, the value can be set in config.h.
635 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
636 absolute limit. Changed the text of the error message to make this clear, and
637 likewise updated the man page.
639 6. The limit of 99 on the number of capturing subpatterns has been removed.
640 The new limit is 65535, which I hope will not be a "real" limit.
643 Release 3.3 01-Aug-00
644 ---------------------
646 There is some support for UTF-8 character strings. This is incomplete and
647 experimental. The documentation describes what is and what is not implemented.
648 Otherwise, this is just a bug-fixing release.
651 Release 3.0 01-Feb-00
652 ---------------------
654 1. A "configure" script is now used to configure PCRE for Unix systems. It
655 builds a Makefile, a config.h file, and the pcre-config script.
657 2. PCRE is built as a shared library by default.
659 3. There is support for POSIX classes such as [:alpha:].
661 5. There is an experimental recursion feature.
663 ----------------------------------------------------------------------------
666 Please note that there has been a change in the API such that a larger
667 ovector is required at matching time, to provide some additional workspace.
668 The new man page has details. This change was necessary in order to support
669 some of the new functionality in Perl 5.005.
673 Another (I hope this is the last!) change has been made to the API for the
674 pcre_compile() function. An additional argument has been added to make it
675 possible to pass over a pointer to character tables built in the current
676 locale by pcre_maketables(). To use the default tables, this new argument
677 should be passed as NULL.
681 Yet another (and again I hope this really is the last) change has been made
682 to the API for the pcre_exec() function. An additional argument has been
683 added to make it possible to start the match other than at the start of the
684 subject string. This is important if there are lookbehinds. The new man
685 page has the details, but you just want to convert existing programs, all
686 you need to do is to stick in a new fifth argument to pcre_exec(), with a
687 value of zero. For example, change
689 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
690 to
691 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
693 ****


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