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Revision 1502 - (show annotations) (download)
Mon Sep 15 13:56:18 2014 UTC (6 days, 2 hours ago) by ph10
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Files tidied for 8.36-RC1.

1 News about PCRE releases
2 ------------------------
3
4 Release 8.36 15-September-2014
5 ------------------------------
6
7 This is primarily a bug-fix release. However, in addition, the Unicode data
8 tables have been updated to Unicode 7.0.0.
9
10
11 Release 8.35 04-April-2014
12 --------------------------
13
14 There have been performance improvements for classes containing non-ASCII
15 characters and the "auto-possessification" feature has been extended. Other
16 minor improvements have been implemented and bugs fixed. There is a new callout
17 feature to enable applications to do detailed stack checks at compile time, to
18 avoid running out of stack for deeply nested parentheses. The JIT compiler has
19 been extended with experimental support for ARM-64, MIPS-64, and PPC-LE.
20
21
22 Release 8.34 15-December-2013
23 -----------------------------
24
25 As well as fixing the inevitable bugs, performance has been improved by
26 refactoring and extending the amount of "auto-possessification" that PCRE does.
27 Other notable changes:
28
29 . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
30 an empty string. If it can, pcretest shows this in its information output.
31
32 . A back reference to a named subpattern when there is more than one of the
33 same name now checks them in the order in which they appear in the pattern.
34 The first one that is set is used for the reference. Previously only the
35 first one was inspected. This change makes PCRE more compatible with Perl.
36
37 . Unicode character properties were updated from Unicode 6.3.0.
38
39 . The character VT has been added to the set of characters that match \s and
40 are generally treated as white space, following this same change in Perl
41 5.18. There is now no difference between "Perl space" and "POSIX space".
42
43 . Perl has changed its handling of \8 and \9. If there is no previously
44 encountered capturing group of those numbers, they are treated as the
45 literal characters 8 and 9 instead of a binary zero followed by the
46 literals. PCRE now does the same.
47
48 . Following Perl, added \o{} to specify codepoints in octal, making it
49 possible to specify values greater than 0777 and also making them
50 unambiguous.
51
52 . In UCP mode, \s was not matching two of the characters that Perl matches,
53 namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
54 were matched by \h.
55
56 . Add JIT support for the 64 bit TileGX architecture.
57
58 . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
59 [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
60 does in Unicode mode.
61
62 . Perl no longer allows group names to start with digits, so I have made this
63 change also in PCRE.
64
65 . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
66 mean "start of word" and "end of word", respectively, as a transition aid.
67
68
69 Release 8.33 28-May-2013
70 --------------------------
71
72 A number of bugs are fixed, and some performance improvements have been made.
73 There are also some new features, of which these are the most important:
74
75 . The behaviour of the backtracking verbs has been rationalized and
76 documented in more detail.
77
78 . JIT now supports callouts and all of the backtracking verbs.
79
80 . Unicode validation has been updated in the light of Unicode Corrigendum #9,
81 which points out that "non characters" are not "characters that may not
82 appear in Unicode strings" but rather "characters that are reserved for
83 internal use and have only local meaning".
84
85 . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
86 creator of a pattern can specify lower (but not higher) limits for the
87 matching process.
88
89 . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
90 the (*UTF) feature, as this could be a security issue.
91
92
93 Release 8.32 30-November-2012
94 -----------------------------
95
96 This release fixes a number of bugs, but also has some new features. These are
97 the highlights:
98
99 . There is now support for 32-bit character strings and UTF-32. Like the
100 16-bit support, this is done by compiling a separate 32-bit library.
101
102 . \X now matches a Unicode extended grapheme cluster.
103
104 . Case-independent matching of Unicode characters that have more than one
105 "other case" now makes all three (or more) characters equivalent. This
106 applies, for example, to Greek Sigma, which has two lowercase versions.
107
108 . Unicode character properties are updated to Unicode 6.2.0.
109
110 . The EBCDIC support, which had decayed, has had a spring clean.
111
112 . A number of JIT optimizations have been added, which give faster JIT
113 execution speed. In addition, a new direct interface to JIT execution is
114 available. This bypasses some of the sanity checks of pcre_exec() to give a
115 noticeable speed-up.
116
117 . A number of issues in pcregrep have been fixed, making it more compatible
118 with GNU grep. In particular, --exclude and --include (and variants) apply
119 to all files now, not just those obtained from scanning a directory
120 recursively. In Windows environments, the default action for directories is
121 now "skip" instead of "read" (which provokes an error).
122
123 . If the --only-matching (-o) option in pcregrep is specified multiple
124 times, each one causes appropriate output. For example, -o1 -o2 outputs the
125 substrings matched by the 1st and 2nd capturing parentheses. A separating
126 string can be specified by --om-separator (default empty).
127
128 . When PCRE is built via Autotools using a version of gcc that has the
129 "visibility" feature, it is used to hide internal library functions that are
130 not part of the public API.
131
132
133 Release 8.31 06-July-2012
134 -------------------------
135
136 This is mainly a bug-fixing release, with a small number of developments:
137
138 . The JIT compiler now supports partial matching and the (*MARK) and
139 (*COMMIT) verbs.
140
141 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
142 pattern.
143
144 . There should be a performance improvement when using the heap instead of the
145 stack for recursion.
146
147 . pcregrep can now be linked with libedit as an alternative to libreadline.
148
149 . pcregrep now has a --file-list option where the list of files to scan is
150 given as a file.
151
152 . pcregrep now recognizes binary files and there are related options.
153
154 . The Unicode tables have been updated to 6.1.0.
155
156 As always, the full list of changes is in the ChangeLog file.
157
158
159 Release 8.30 04-February-2012
160 -----------------------------
161
162 Release 8.30 introduces a major new feature: support for 16-bit character
163 strings, compiled as a separate library. There are a few changes to the
164 8-bit library, in addition to some bug fixes.
165
166 . The pcre_info() function, which has been obsolete for over 10 years, has
167 been removed.
168
169 . When a compiled pattern was saved to a file and later reloaded on a host
170 with different endianness, PCRE used automatically to swap the bytes in some
171 of the data fields. With the advent of the 16-bit library, where more of this
172 swapping is needed, it is no longer done automatically. Instead, the bad
173 endianness is detected and a specific error is given. The user can then call
174 a new function called pcre_pattern_to_host_byte_order() (or an equivalent
175 16-bit function) to do the swap.
176
177 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
178 code points and are now faulted. (They are the so-called "surrogates"
179 that are reserved for coding high values in UTF-16.)
180
181
182 Release 8.21 12-Dec-2011
183 ------------------------
184
185 This is almost entirely a bug-fix release. The only new feature is the ability
186 to obtain the size of the memory used by the JIT compiler.
187
188
189 Release 8.20 21-Oct-2011
190 ------------------------
191
192 The main change in this release is the inclusion of Zoltan Herczeg's
193 just-in-time compiler support, which can be accessed by building PCRE with
194 --enable-jit. Large performance benefits can be had in many situations. 8.20
195 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
196 a number of infelicities and differences from Perl.
197
198
199 Release 8.13 16-Aug-2011
200 ------------------------
201
202 This is mainly a bug-fix release. There has been a lot of internal refactoring.
203 The Unicode tables have been updated. The only new feature in the library is
204 the passing of *MARK information to callouts. Some additions have been made to
205 pcretest to make testing easier and more comprehensive. There is a new option
206 for pcregrep to adjust its internal buffer size.
207
208
209 Release 8.12 15-Jan-2011
210 ------------------------
211
212 This release fixes some bugs in pcregrep, one of which caused the tests to fail
213 on 64-bit big-endian systems. There are no changes to the code of the library.
214
215
216 Release 8.11 10-Dec-2010
217 ------------------------
218
219 A number of bugs in the library and in pcregrep have been fixed. As always, see
220 ChangeLog for details. The following are the non-bug-fix changes:
221
222 . Added --match-limit and --recursion-limit to pcregrep.
223
224 . Added an optional parentheses number to the -o and --only-matching options
225 of pcregrep.
226
227 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
228 \B.
229
230 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
231 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
232
233 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
234 START_OPTIMIZE option, which is now allowed at compile time
235
236
237 Release 8.10 25-Jun-2010
238 ------------------------
239
240 There are two major additions: support for (*MARK) and friends, and the option
241 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
242 opposites) so that they make use of Unicode properties. There are also a number
243 of lesser new features, and several bugs have been fixed. A new option,
244 --line-buffered, has been added to pcregrep, for use when it is connected to
245 pipes.
246
247
248 Release 8.02 19-Mar-2010
249 ------------------------
250
251 Another bug-fix release.
252
253
254 Release 8.01 19-Jan-2010
255 ------------------------
256
257 This is a bug-fix release. Several bugs in the code itself and some bugs and
258 infelicities in the build system have been fixed.
259
260
261 Release 8.00 19-Oct-09
262 ----------------------
263
264 Bugs have been fixed in the library and in pcregrep. There are also some
265 enhancements. Restrictions on patterns used for partial matching have been
266 removed, extra information is given for partial matches, the partial matching
267 process has been improved, and an option to make a partial match override a
268 full match is available. The "study" process has been enhanced by finding a
269 lower bound matching length. Groups with duplicate numbers may now have
270 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
271 different names. The documentation has been revised to reflect these changes.
272 The version number has been expanded to 3 digits as it is clear that the rate
273 of change is not slowing down.
274
275
276 Release 7.9 11-Apr-09
277 ---------------------
278
279 Mostly bugfixes and tidies with just a couple of minor functional additions.
280
281
282 Release 7.8 05-Sep-08
283 ---------------------
284
285 More bug fixes, plus a performance improvement in Unicode character property
286 lookup.
287
288
289 Release 7.7 07-May-08
290 ---------------------
291
292 This is once again mainly a bug-fix release, but there are a couple of new
293 features.
294
295
296 Release 7.6 28-Jan-08
297 ---------------------
298
299 The main reason for having this release so soon after 7.5 is because it fixes a
300 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
301 addition, the CMake configuration files have been brought up to date.
302
303
304 Release 7.5 10-Jan-08
305 ---------------------
306
307 This is mainly a bug-fix release. However the ability to link pcregrep with
308 libz or libbz2 and the ability to link pcretest with libreadline have been
309 added. Also the --line-offsets and --file-offsets options were added to
310 pcregrep.
311
312
313 Release 7.4 21-Sep-07
314 ---------------------
315
316 The only change of specification is the addition of options to control whether
317 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
318 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
319 relocations needed in a shared library. There have also been some documentation
320 updates, in particular, some more information about using CMake to build PCRE
321 has been added to the NON-UNIX-USE file.
322
323
324 Release 7.3 28-Aug-07
325 ---------------------
326
327 Most changes are bug fixes. Some that are not:
328
329 1. There is some support for Perl 5.10's experimental "backtracking control
330 verbs" such as (*PRUNE).
331
332 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
333 restrictive in the strings it accepts.
334
335 3. Checking for potential integer overflow has been made more dynamic, and as a
336 consequence there is no longer a hard limit on the size of a subpattern that
337 has a limited repeat count.
338
339 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
340 no longer advance by two characters instead of one when an unanchored match
341 fails at CRLF if there are explicit CR or LF matches within the pattern.
342 This gets rid of some anomalous effects that previously occurred.
343
344 5. Some PCRE-specific settings for varying the newline options at the start of
345 a pattern have been added.
346
347
348 Release 7.2 19-Jun-07
349 ---------------------
350
351 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
352 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
353 and \V).
354
355 Correction to the notes for 7.1: the note about shared libraries for Windows is
356 wrong. Previously, three libraries were built, but each could function
357 independently. For example, the pcreposix library also included all the
358 functions from the basic pcre library. The change is that the three libraries
359 are no longer independent. They are like the Unix libraries. To use the
360 pcreposix functions, for example, you need to link with both the pcreposix and
361 the basic pcre library.
362
363 Some more features from Perl 5.10 have been added:
364
365 (?-n) and (?+n) relative references for recursion and subroutines.
366
367 (?(-n) and (?(+n) relative references as conditions.
368
369 \k{name} and \g{name} are synonyms for \k<name>.
370
371 \K to reset the start of the matched string; for example, (foo)\Kbar
372 matches bar preceded by foo, but only sets bar as the matched string.
373
374 (?| introduces a group where the capturing parentheses in each alternative
375 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
376 parentheses number 1 in both cases.
377
378 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
379
380
381 Release 7.1 24-Apr-07
382 ---------------------
383
384 There is only one new feature in this release: a linebreak setting of
385 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
386 recognizes only CRLF, CR, and LF as linebreaks.
387
388 A few bugs are fixed (see ChangeLog for details), but the major change is a
389 complete re-implementation of the build system. This now has full Autotools
390 support and so is now "standard" in some sense. It should help with compiling
391 PCRE in a wide variety of environments.
392
393 NOTE: when building shared libraries for Windows, three dlls are now built,
394 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
395 included in a single dll.
396
397 Another important change is that the dftables auxiliary program is no longer
398 compiled and run at "make" time by default. Instead, a default set of character
399 tables (assuming ASCII coding) is used. If you want to use dftables to generate
400 the character tables as previously, add --enable-rebuild-chartables to the
401 "configure" command. You must do this if you are compiling PCRE to run on a
402 system that uses EBCDIC code.
403
404 There is a discussion about character tables in the README file. The default is
405 not to use dftables so that that there is no problem when cross-compiling.
406
407
408 Release 7.0 19-Dec-06
409 ---------------------
410
411 This release has a new major number because there have been some internal
412 upheavals to facilitate the addition of new optimizations and other facilities,
413 and to make subsequent maintenance and extension easier. Compilation is likely
414 to be a bit slower, but there should be no major effect on runtime performance.
415 Previously compiled patterns are NOT upwards compatible with this release. If
416 you have saved compiled patterns from a previous release, you will have to
417 re-compile them. Important changes that are visible to users are:
418
419 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
420 some more scripts.
421
422 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
423 sequence as a newline.
424
425 3. The \R escape matches a single Unicode newline sequence as a single unit.
426
427 4. New features that will appear in Perl 5.10 are now in PCRE. These include
428 alternative Perl syntax for named parentheses, and Perl syntax for
429 recursion.
430
431 5. The C++ wrapper interface has been extended by the addition of a
432 QuoteMeta function and the ability to allow copy construction and
433 assignment.
434
435 For a complete list of changes, see the ChangeLog file.
436
437
438 Release 6.7 04-Jul-06
439 ---------------------
440
441 The main additions to this release are the ability to use the same name for
442 multiple sets of parentheses, and support for CRLF line endings in both the
443 library and pcregrep (and in pcretest for testing).
444
445 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
446 significantly reduced for certain subject strings.
447
448
449 Release 6.5 01-Feb-06
450 ---------------------
451
452 Important changes in this release:
453
454 1. A number of new features have been added to pcregrep.
455
456 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
457 supported properties have been extended with script names such as "Arabic",
458 and the derived properties "Any" and "L&". This has necessitated a change to
459 the interal format of compiled patterns. Any saved compiled patterns that
460 use \p or \P must be recompiled.
461
462 3. The specification of recursion in patterns has been changed so that all
463 recursive subpatterns are automatically treated as atomic groups. Thus, for
464 example, (?R) is treated as if it were (?>(?R)). This is necessary because
465 otherwise there are situations where recursion does not work.
466
467 See the ChangeLog for a complete list of changes, which include a number of bug
468 fixes and tidies.
469
470
471 Release 6.0 07-Jun-05
472 ---------------------
473
474 The release number has been increased to 6.0 because of the addition of several
475 major new pieces of functionality.
476
477 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
478 algorithm, has been added. This has a number of advantages for certain cases,
479 though it does run more slowly, and lacks the ability to capture substrings. On
480 the other hand, it does find all matches, not just the first, and it works
481 better for partial matching. The pcrematching man page discusses the
482 differences.
483
484 The pcretest program has been enhanced so that it can make use of the new
485 pcre_dfa_exec() matching function and the extra features it provides.
486
487 The distribution now includes a C++ wrapper library. This is built
488 automatically if a C++ compiler is found. The pcrecpp man page discusses this
489 interface.
490
491 The code itself has been re-organized into many more files, one for each
492 function, so it no longer requires everything to be linked in when static
493 linkage is used. As a consequence, some internal functions have had to have
494 their names exposed. These functions all have names starting with _pcre_. They
495 are undocumented, and are not intended for use by outside callers.
496
497 The pcregrep program has been enhanced with new functionality such as
498 multiline-matching and options for output more matching context. See the
499 ChangeLog for a complete list of changes to the library and the utility
500 programs.
501
502
503 Release 5.0 13-Sep-04
504 ---------------------
505
506 The licence under which PCRE is released has been changed to the more
507 conventional "BSD" licence.
508
509 In the code, some bugs have been fixed, and there are also some major changes
510 in this release (which is why I've increased the number to 5.0). Some changes
511 are internal rearrangements, and some provide a number of new facilities. The
512 new features are:
513
514 1. There's an "automatic callout" feature that inserts callouts before every
515 item in the regex, and there's a new callout field that gives the position
516 in the pattern - useful for debugging and tracing.
517
518 2. The extra_data structure can now be used to pass in a set of character
519 tables at exec time. This is useful if compiled regex are saved and re-used
520 at a later time when the tables may not be at the same address. If the
521 default internal tables are used, the pointer saved with the compiled
522 pattern is now set to NULL, which means that you don't need to do anything
523 special unless you are using custom tables.
524
525 3. It is possible, with some restrictions on the content of the regex, to
526 request "partial" matching. A special return code is given if all of the
527 subject string matched part of the regex. This could be useful for testing
528 an input field as it is being typed.
529
530 4. There is now some optional support for Unicode character properties, which
531 means that the patterns items such as \p{Lu} and \X can now be used. Only
532 the general category properties are supported. If PCRE is compiled with this
533 support, an additional 90K data structure is include, which increases the
534 size of the library dramatically.
535
536 5. There is support for saving compiled patterns and re-using them later.
537
538 6. There is support for running regular expressions that were compiled on a
539 different host with the opposite endianness.
540
541 7. The pcretest program has been extended to accommodate the new features.
542
543 The main internal rearrangement is that sequences of literal characters are no
544 longer handled as strings. Instead, each character is handled on its own. This
545 makes some UTF-8 handling easier, and makes the support of partial matching
546 possible. Compiled patterns containing long literal strings will be larger as a
547 result of this change; I hope that performance will not be much affected.
548
549
550 Release 4.5 01-Dec-03
551 ---------------------
552
553 Again mainly a bug-fix and tidying release, with only a couple of new features:
554
555 1. It's possible now to compile PCRE so that it does not use recursive
556 function calls when matching. Instead it gets memory from the heap. This slows
557 things down, but may be necessary on systems with limited stacks.
558
559 2. UTF-8 string checking has been tightened to reject overlong sequences and to
560 check that a starting offset points to the start of a character. Failure of the
561 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
562
563 3. PCRE can now be compiled for systems that use EBCDIC code.
564
565
566 Release 4.4 21-Aug-03
567 ---------------------
568
569 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
570 checks UTF-8 strings for validity by default. There is an option to suppress
571 this, just in case anybody wants that teeny extra bit of performance.
572
573
574 Releases 4.1 - 4.3
575 ------------------
576
577 Sorry, I forgot about updating the NEWS file for these releases. Please take a
578 look at ChangeLog.
579
580
581 Release 4.0 17-Feb-03
582 ---------------------
583
584 There have been a lot of changes for the 4.0 release, adding additional
585 functionality and mending bugs. Below is a list of the highlights of the new
586 functionality. For full details of these features, please consult the
587 documentation. For a complete list of changes, see the ChangeLog file.
588
589 1. Support for Perl's \Q...\E escapes.
590
591 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
592 package. They provide some syntactic sugar for simple cases of "atomic
593 grouping".
594
595 3. Support for the \G assertion. It is true when the current matching position
596 is at the start point of the match.
597
598 4. A new feature that provides some of the functionality that Perl provides
599 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
600 is for the caller to provide an optional function, by setting pcre_callout to
601 its entry point. To get the function called, the regex must include (?C) at
602 appropriate points.
603
604 5. Support for recursive calls to individual subpatterns. This makes it really
605 easy to get totally confused.
606
607 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
608 name a group.
609
610 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
611 option for pcregrep to make it operate in UTF-8 mode.
612
613 8. The single man page has been split into a number of separate man pages.
614 These also give rise to individual HTML pages which are put in a separate
615 directory. There is an index.html page that lists them all. Some hyperlinking
616 between the pages has been installed.
617
618
619 Release 3.5 15-Aug-01
620 ---------------------
621
622 1. The configuring system has been upgraded to use later versions of autoconf
623 and libtool. By default it builds both a shared and a static library if the OS
624 supports it. You can use --disable-shared or --disable-static on the configure
625 command if you want only one of them.
626
627 2. The pcretest utility is now installed along with pcregrep because it is
628 useful for users (to test regexs) and by doing this, it automatically gets
629 relinked by libtool. The documentation has been turned into a man page, so
630 there are now .1, .txt, and .html versions in /doc.
631
632 3. Upgrades to pcregrep:
633 (i) Added long-form option names like gnu grep.
634 (ii) Added --help to list all options with an explanatory phrase.
635 (iii) Added -r, --recursive to recurse into sub-directories.
636 (iv) Added -f, --file to read patterns from a file.
637
638 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
639 script, to force use of CR or LF instead of \n in the source. On non-Unix
640 systems, the value can be set in config.h.
641
642 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
643 absolute limit. Changed the text of the error message to make this clear, and
644 likewise updated the man page.
645
646 6. The limit of 99 on the number of capturing subpatterns has been removed.
647 The new limit is 65535, which I hope will not be a "real" limit.
648
649
650 Release 3.3 01-Aug-00
651 ---------------------
652
653 There is some support for UTF-8 character strings. This is incomplete and
654 experimental. The documentation describes what is and what is not implemented.
655 Otherwise, this is just a bug-fixing release.
656
657
658 Release 3.0 01-Feb-00
659 ---------------------
660
661 1. A "configure" script is now used to configure PCRE for Unix systems. It
662 builds a Makefile, a config.h file, and the pcre-config script.
663
664 2. PCRE is built as a shared library by default.
665
666 3. There is support for POSIX classes such as [:alpha:].
667
668 5. There is an experimental recursion feature.
669
670 ----------------------------------------------------------------------------
671 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
672
673 Please note that there has been a change in the API such that a larger
674 ovector is required at matching time, to provide some additional workspace.
675 The new man page has details. This change was necessary in order to support
676 some of the new functionality in Perl 5.005.
677
678 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
679
680 Another (I hope this is the last!) change has been made to the API for the
681 pcre_compile() function. An additional argument has been added to make it
682 possible to pass over a pointer to character tables built in the current
683 locale by pcre_maketables(). To use the default tables, this new argument
684 should be passed as NULL.
685
686 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
687
688 Yet another (and again I hope this really is the last) change has been made
689 to the API for the pcre_exec() function. An additional argument has been
690 added to make it possible to start the match other than at the start of the
691 subject string. This is important if there are lookbehinds. The new man
692 page has the details, but you just want to convert existing programs, all
693 you need to do is to stick in a new fifth argument to pcre_exec(), with a
694 value of zero. For example, change
695
696 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
697 to
698 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
699
700 ****

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