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Final tidies for 8.37
1 News about PCRE releases
2 ------------------------
3
4 Release 8.37 28-April-2015
5 --------------------------
6
7 This is bug-fix release. Note that this library (now called PCRE1) is now being
8 maintained for bug fixes only. New projects are advised to use the new PCRE2
9 libraries.
10
11
12 Release 8.36 26-September-2014
13 ------------------------------
14
15 This is primarily a bug-fix release. However, in addition, the Unicode data
16 tables have been updated to Unicode 7.0.0.
17
18
19 Release 8.35 04-April-2014
20 --------------------------
21
22 There have been performance improvements for classes containing non-ASCII
23 characters and the "auto-possessification" feature has been extended. Other
24 minor improvements have been implemented and bugs fixed. There is a new callout
25 feature to enable applications to do detailed stack checks at compile time, to
26 avoid running out of stack for deeply nested parentheses. The JIT compiler has
27 been extended with experimental support for ARM-64, MIPS-64, and PPC-LE.
28
29
30 Release 8.34 15-December-2013
31 -----------------------------
32
33 As well as fixing the inevitable bugs, performance has been improved by
34 refactoring and extending the amount of "auto-possessification" that PCRE does.
35 Other notable changes:
36
37 . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
38 an empty string. If it can, pcretest shows this in its information output.
39
40 . A back reference to a named subpattern when there is more than one of the
41 same name now checks them in the order in which they appear in the pattern.
42 The first one that is set is used for the reference. Previously only the
43 first one was inspected. This change makes PCRE more compatible with Perl.
44
45 . Unicode character properties were updated from Unicode 6.3.0.
46
47 . The character VT has been added to the set of characters that match \s and
48 are generally treated as white space, following this same change in Perl
49 5.18. There is now no difference between "Perl space" and "POSIX space".
50
51 . Perl has changed its handling of \8 and \9. If there is no previously
52 encountered capturing group of those numbers, they are treated as the
53 literal characters 8 and 9 instead of a binary zero followed by the
54 literals. PCRE now does the same.
55
56 . Following Perl, added \o{} to specify codepoints in octal, making it
57 possible to specify values greater than 0777 and also making them
58 unambiguous.
59
60 . In UCP mode, \s was not matching two of the characters that Perl matches,
61 namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
62 were matched by \h.
63
64 . Add JIT support for the 64 bit TileGX architecture.
65
66 . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
67 [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
68 does in Unicode mode.
69
70 . Perl no longer allows group names to start with digits, so I have made this
71 change also in PCRE.
72
73 . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
74 mean "start of word" and "end of word", respectively, as a transition aid.
75
76
77 Release 8.33 28-May-2013
78 --------------------------
79
80 A number of bugs are fixed, and some performance improvements have been made.
81 There are also some new features, of which these are the most important:
82
83 . The behaviour of the backtracking verbs has been rationalized and
84 documented in more detail.
85
86 . JIT now supports callouts and all of the backtracking verbs.
87
88 . Unicode validation has been updated in the light of Unicode Corrigendum #9,
89 which points out that "non characters" are not "characters that may not
90 appear in Unicode strings" but rather "characters that are reserved for
91 internal use and have only local meaning".
92
93 . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
94 creator of a pattern can specify lower (but not higher) limits for the
95 matching process.
96
97 . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
98 the (*UTF) feature, as this could be a security issue.
99
100
101 Release 8.32 30-November-2012
102 -----------------------------
103
104 This release fixes a number of bugs, but also has some new features. These are
105 the highlights:
106
107 . There is now support for 32-bit character strings and UTF-32. Like the
108 16-bit support, this is done by compiling a separate 32-bit library.
109
110 . \X now matches a Unicode extended grapheme cluster.
111
112 . Case-independent matching of Unicode characters that have more than one
113 "other case" now makes all three (or more) characters equivalent. This
114 applies, for example, to Greek Sigma, which has two lowercase versions.
115
116 . Unicode character properties are updated to Unicode 6.2.0.
117
118 . The EBCDIC support, which had decayed, has had a spring clean.
119
120 . A number of JIT optimizations have been added, which give faster JIT
121 execution speed. In addition, a new direct interface to JIT execution is
122 available. This bypasses some of the sanity checks of pcre_exec() to give a
123 noticeable speed-up.
124
125 . A number of issues in pcregrep have been fixed, making it more compatible
126 with GNU grep. In particular, --exclude and --include (and variants) apply
127 to all files now, not just those obtained from scanning a directory
128 recursively. In Windows environments, the default action for directories is
129 now "skip" instead of "read" (which provokes an error).
130
131 . If the --only-matching (-o) option in pcregrep is specified multiple
132 times, each one causes appropriate output. For example, -o1 -o2 outputs the
133 substrings matched by the 1st and 2nd capturing parentheses. A separating
134 string can be specified by --om-separator (default empty).
135
136 . When PCRE is built via Autotools using a version of gcc that has the
137 "visibility" feature, it is used to hide internal library functions that are
138 not part of the public API.
139
140
141 Release 8.31 06-July-2012
142 -------------------------
143
144 This is mainly a bug-fixing release, with a small number of developments:
145
146 . The JIT compiler now supports partial matching and the (*MARK) and
147 (*COMMIT) verbs.
148
149 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
150 pattern.
151
152 . There should be a performance improvement when using the heap instead of the
153 stack for recursion.
154
155 . pcregrep can now be linked with libedit as an alternative to libreadline.
156
157 . pcregrep now has a --file-list option where the list of files to scan is
158 given as a file.
159
160 . pcregrep now recognizes binary files and there are related options.
161
162 . The Unicode tables have been updated to 6.1.0.
163
164 As always, the full list of changes is in the ChangeLog file.
165
166
167 Release 8.30 04-February-2012
168 -----------------------------
169
170 Release 8.30 introduces a major new feature: support for 16-bit character
171 strings, compiled as a separate library. There are a few changes to the
172 8-bit library, in addition to some bug fixes.
173
174 . The pcre_info() function, which has been obsolete for over 10 years, has
175 been removed.
176
177 . When a compiled pattern was saved to a file and later reloaded on a host
178 with different endianness, PCRE used automatically to swap the bytes in some
179 of the data fields. With the advent of the 16-bit library, where more of this
180 swapping is needed, it is no longer done automatically. Instead, the bad
181 endianness is detected and a specific error is given. The user can then call
182 a new function called pcre_pattern_to_host_byte_order() (or an equivalent
183 16-bit function) to do the swap.
184
185 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
186 code points and are now faulted. (They are the so-called "surrogates"
187 that are reserved for coding high values in UTF-16.)
188
189
190 Release 8.21 12-Dec-2011
191 ------------------------
192
193 This is almost entirely a bug-fix release. The only new feature is the ability
194 to obtain the size of the memory used by the JIT compiler.
195
196
197 Release 8.20 21-Oct-2011
198 ------------------------
199
200 The main change in this release is the inclusion of Zoltan Herczeg's
201 just-in-time compiler support, which can be accessed by building PCRE with
202 --enable-jit. Large performance benefits can be had in many situations. 8.20
203 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
204 a number of infelicities and differences from Perl.
205
206
207 Release 8.13 16-Aug-2011
208 ------------------------
209
210 This is mainly a bug-fix release. There has been a lot of internal refactoring.
211 The Unicode tables have been updated. The only new feature in the library is
212 the passing of *MARK information to callouts. Some additions have been made to
213 pcretest to make testing easier and more comprehensive. There is a new option
214 for pcregrep to adjust its internal buffer size.
215
216
217 Release 8.12 15-Jan-2011
218 ------------------------
219
220 This release fixes some bugs in pcregrep, one of which caused the tests to fail
221 on 64-bit big-endian systems. There are no changes to the code of the library.
222
223
224 Release 8.11 10-Dec-2010
225 ------------------------
226
227 A number of bugs in the library and in pcregrep have been fixed. As always, see
228 ChangeLog for details. The following are the non-bug-fix changes:
229
230 . Added --match-limit and --recursion-limit to pcregrep.
231
232 . Added an optional parentheses number to the -o and --only-matching options
233 of pcregrep.
234
235 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
236 \B.
237
238 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
239 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
240
241 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
242 START_OPTIMIZE option, which is now allowed at compile time
243
244
245 Release 8.10 25-Jun-2010
246 ------------------------
247
248 There are two major additions: support for (*MARK) and friends, and the option
249 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
250 opposites) so that they make use of Unicode properties. There are also a number
251 of lesser new features, and several bugs have been fixed. A new option,
252 --line-buffered, has been added to pcregrep, for use when it is connected to
253 pipes.
254
255
256 Release 8.02 19-Mar-2010
257 ------------------------
258
259 Another bug-fix release.
260
261
262 Release 8.01 19-Jan-2010
263 ------------------------
264
265 This is a bug-fix release. Several bugs in the code itself and some bugs and
266 infelicities in the build system have been fixed.
267
268
269 Release 8.00 19-Oct-09
270 ----------------------
271
272 Bugs have been fixed in the library and in pcregrep. There are also some
273 enhancements. Restrictions on patterns used for partial matching have been
274 removed, extra information is given for partial matches, the partial matching
275 process has been improved, and an option to make a partial match override a
276 full match is available. The "study" process has been enhanced by finding a
277 lower bound matching length. Groups with duplicate numbers may now have
278 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
279 different names. The documentation has been revised to reflect these changes.
280 The version number has been expanded to 3 digits as it is clear that the rate
281 of change is not slowing down.
282
283
284 Release 7.9 11-Apr-09
285 ---------------------
286
287 Mostly bugfixes and tidies with just a couple of minor functional additions.
288
289
290 Release 7.8 05-Sep-08
291 ---------------------
292
293 More bug fixes, plus a performance improvement in Unicode character property
294 lookup.
295
296
297 Release 7.7 07-May-08
298 ---------------------
299
300 This is once again mainly a bug-fix release, but there are a couple of new
301 features.
302
303
304 Release 7.6 28-Jan-08
305 ---------------------
306
307 The main reason for having this release so soon after 7.5 is because it fixes a
308 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
309 addition, the CMake configuration files have been brought up to date.
310
311
312 Release 7.5 10-Jan-08
313 ---------------------
314
315 This is mainly a bug-fix release. However the ability to link pcregrep with
316 libz or libbz2 and the ability to link pcretest with libreadline have been
317 added. Also the --line-offsets and --file-offsets options were added to
318 pcregrep.
319
320
321 Release 7.4 21-Sep-07
322 ---------------------
323
324 The only change of specification is the addition of options to control whether
325 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
326 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
327 relocations needed in a shared library. There have also been some documentation
328 updates, in particular, some more information about using CMake to build PCRE
329 has been added to the NON-UNIX-USE file.
330
331
332 Release 7.3 28-Aug-07
333 ---------------------
334
335 Most changes are bug fixes. Some that are not:
336
337 1. There is some support for Perl 5.10's experimental "backtracking control
338 verbs" such as (*PRUNE).
339
340 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
341 restrictive in the strings it accepts.
342
343 3. Checking for potential integer overflow has been made more dynamic, and as a
344 consequence there is no longer a hard limit on the size of a subpattern that
345 has a limited repeat count.
346
347 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
348 no longer advance by two characters instead of one when an unanchored match
349 fails at CRLF if there are explicit CR or LF matches within the pattern.
350 This gets rid of some anomalous effects that previously occurred.
351
352 5. Some PCRE-specific settings for varying the newline options at the start of
353 a pattern have been added.
354
355
356 Release 7.2 19-Jun-07
357 ---------------------
358
359 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
360 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
361 and \V).
362
363 Correction to the notes for 7.1: the note about shared libraries for Windows is
364 wrong. Previously, three libraries were built, but each could function
365 independently. For example, the pcreposix library also included all the
366 functions from the basic pcre library. The change is that the three libraries
367 are no longer independent. They are like the Unix libraries. To use the
368 pcreposix functions, for example, you need to link with both the pcreposix and
369 the basic pcre library.
370
371 Some more features from Perl 5.10 have been added:
372
373 (?-n) and (?+n) relative references for recursion and subroutines.
374
375 (?(-n) and (?(+n) relative references as conditions.
376
377 \k{name} and \g{name} are synonyms for \k<name>.
378
379 \K to reset the start of the matched string; for example, (foo)\Kbar
380 matches bar preceded by foo, but only sets bar as the matched string.
381
382 (?| introduces a group where the capturing parentheses in each alternative
383 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
384 parentheses number 1 in both cases.
385
386 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
387
388
389 Release 7.1 24-Apr-07
390 ---------------------
391
392 There is only one new feature in this release: a linebreak setting of
393 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
394 recognizes only CRLF, CR, and LF as linebreaks.
395
396 A few bugs are fixed (see ChangeLog for details), but the major change is a
397 complete re-implementation of the build system. This now has full Autotools
398 support and so is now "standard" in some sense. It should help with compiling
399 PCRE in a wide variety of environments.
400
401 NOTE: when building shared libraries for Windows, three dlls are now built,
402 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
403 included in a single dll.
404
405 Another important change is that the dftables auxiliary program is no longer
406 compiled and run at "make" time by default. Instead, a default set of character
407 tables (assuming ASCII coding) is used. If you want to use dftables to generate
408 the character tables as previously, add --enable-rebuild-chartables to the
409 "configure" command. You must do this if you are compiling PCRE to run on a
410 system that uses EBCDIC code.
411
412 There is a discussion about character tables in the README file. The default is
413 not to use dftables so that that there is no problem when cross-compiling.
414
415
416 Release 7.0 19-Dec-06
417 ---------------------
418
419 This release has a new major number because there have been some internal
420 upheavals to facilitate the addition of new optimizations and other facilities,
421 and to make subsequent maintenance and extension easier. Compilation is likely
422 to be a bit slower, but there should be no major effect on runtime performance.
423 Previously compiled patterns are NOT upwards compatible with this release. If
424 you have saved compiled patterns from a previous release, you will have to
425 re-compile them. Important changes that are visible to users are:
426
427 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
428 some more scripts.
429
430 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
431 sequence as a newline.
432
433 3. The \R escape matches a single Unicode newline sequence as a single unit.
434
435 4. New features that will appear in Perl 5.10 are now in PCRE. These include
436 alternative Perl syntax for named parentheses, and Perl syntax for
437 recursion.
438
439 5. The C++ wrapper interface has been extended by the addition of a
440 QuoteMeta function and the ability to allow copy construction and
441 assignment.
442
443 For a complete list of changes, see the ChangeLog file.
444
445
446 Release 6.7 04-Jul-06
447 ---------------------
448
449 The main additions to this release are the ability to use the same name for
450 multiple sets of parentheses, and support for CRLF line endings in both the
451 library and pcregrep (and in pcretest for testing).
452
453 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
454 significantly reduced for certain subject strings.
455
456
457 Release 6.5 01-Feb-06
458 ---------------------
459
460 Important changes in this release:
461
462 1. A number of new features have been added to pcregrep.
463
464 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
465 supported properties have been extended with script names such as "Arabic",
466 and the derived properties "Any" and "L&". This has necessitated a change to
467 the interal format of compiled patterns. Any saved compiled patterns that
468 use \p or \P must be recompiled.
469
470 3. The specification of recursion in patterns has been changed so that all
471 recursive subpatterns are automatically treated as atomic groups. Thus, for
472 example, (?R) is treated as if it were (?>(?R)). This is necessary because
473 otherwise there are situations where recursion does not work.
474
475 See the ChangeLog for a complete list of changes, which include a number of bug
476 fixes and tidies.
477
478
479 Release 6.0 07-Jun-05
480 ---------------------
481
482 The release number has been increased to 6.0 because of the addition of several
483 major new pieces of functionality.
484
485 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
486 algorithm, has been added. This has a number of advantages for certain cases,
487 though it does run more slowly, and lacks the ability to capture substrings. On
488 the other hand, it does find all matches, not just the first, and it works
489 better for partial matching. The pcrematching man page discusses the
490 differences.
491
492 The pcretest program has been enhanced so that it can make use of the new
493 pcre_dfa_exec() matching function and the extra features it provides.
494
495 The distribution now includes a C++ wrapper library. This is built
496 automatically if a C++ compiler is found. The pcrecpp man page discusses this
497 interface.
498
499 The code itself has been re-organized into many more files, one for each
500 function, so it no longer requires everything to be linked in when static
501 linkage is used. As a consequence, some internal functions have had to have
502 their names exposed. These functions all have names starting with _pcre_. They
503 are undocumented, and are not intended for use by outside callers.
504
505 The pcregrep program has been enhanced with new functionality such as
506 multiline-matching and options for output more matching context. See the
507 ChangeLog for a complete list of changes to the library and the utility
508 programs.
509
510
511 Release 5.0 13-Sep-04
512 ---------------------
513
514 The licence under which PCRE is released has been changed to the more
515 conventional "BSD" licence.
516
517 In the code, some bugs have been fixed, and there are also some major changes
518 in this release (which is why I've increased the number to 5.0). Some changes
519 are internal rearrangements, and some provide a number of new facilities. The
520 new features are:
521
522 1. There's an "automatic callout" feature that inserts callouts before every
523 item in the regex, and there's a new callout field that gives the position
524 in the pattern - useful for debugging and tracing.
525
526 2. The extra_data structure can now be used to pass in a set of character
527 tables at exec time. This is useful if compiled regex are saved and re-used
528 at a later time when the tables may not be at the same address. If the
529 default internal tables are used, the pointer saved with the compiled
530 pattern is now set to NULL, which means that you don't need to do anything
531 special unless you are using custom tables.
532
533 3. It is possible, with some restrictions on the content of the regex, to
534 request "partial" matching. A special return code is given if all of the
535 subject string matched part of the regex. This could be useful for testing
536 an input field as it is being typed.
537
538 4. There is now some optional support for Unicode character properties, which
539 means that the patterns items such as \p{Lu} and \X can now be used. Only
540 the general category properties are supported. If PCRE is compiled with this
541 support, an additional 90K data structure is include, which increases the
542 size of the library dramatically.
543
544 5. There is support for saving compiled patterns and re-using them later.
545
546 6. There is support for running regular expressions that were compiled on a
547 different host with the opposite endianness.
548
549 7. The pcretest program has been extended to accommodate the new features.
550
551 The main internal rearrangement is that sequences of literal characters are no
552 longer handled as strings. Instead, each character is handled on its own. This
553 makes some UTF-8 handling easier, and makes the support of partial matching
554 possible. Compiled patterns containing long literal strings will be larger as a
555 result of this change; I hope that performance will not be much affected.
556
557
558 Release 4.5 01-Dec-03
559 ---------------------
560
561 Again mainly a bug-fix and tidying release, with only a couple of new features:
562
563 1. It's possible now to compile PCRE so that it does not use recursive
564 function calls when matching. Instead it gets memory from the heap. This slows
565 things down, but may be necessary on systems with limited stacks.
566
567 2. UTF-8 string checking has been tightened to reject overlong sequences and to
568 check that a starting offset points to the start of a character. Failure of the
569 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
570
571 3. PCRE can now be compiled for systems that use EBCDIC code.
572
573
574 Release 4.4 21-Aug-03
575 ---------------------
576
577 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
578 checks UTF-8 strings for validity by default. There is an option to suppress
579 this, just in case anybody wants that teeny extra bit of performance.
580
581
582 Releases 4.1 - 4.3
583 ------------------
584
585 Sorry, I forgot about updating the NEWS file for these releases. Please take a
586 look at ChangeLog.
587
588
589 Release 4.0 17-Feb-03
590 ---------------------
591
592 There have been a lot of changes for the 4.0 release, adding additional
593 functionality and mending bugs. Below is a list of the highlights of the new
594 functionality. For full details of these features, please consult the
595 documentation. For a complete list of changes, see the ChangeLog file.
596
597 1. Support for Perl's \Q...\E escapes.
598
599 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
600 package. They provide some syntactic sugar for simple cases of "atomic
601 grouping".
602
603 3. Support for the \G assertion. It is true when the current matching position
604 is at the start point of the match.
605
606 4. A new feature that provides some of the functionality that Perl provides
607 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
608 is for the caller to provide an optional function, by setting pcre_callout to
609 its entry point. To get the function called, the regex must include (?C) at
610 appropriate points.
611
612 5. Support for recursive calls to individual subpatterns. This makes it really
613 easy to get totally confused.
614
615 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
616 name a group.
617
618 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
619 option for pcregrep to make it operate in UTF-8 mode.
620
621 8. The single man page has been split into a number of separate man pages.
622 These also give rise to individual HTML pages which are put in a separate
623 directory. There is an index.html page that lists them all. Some hyperlinking
624 between the pages has been installed.
625
626
627 Release 3.5 15-Aug-01
628 ---------------------
629
630 1. The configuring system has been upgraded to use later versions of autoconf
631 and libtool. By default it builds both a shared and a static library if the OS
632 supports it. You can use --disable-shared or --disable-static on the configure
633 command if you want only one of them.
634
635 2. The pcretest utility is now installed along with pcregrep because it is
636 useful for users (to test regexs) and by doing this, it automatically gets
637 relinked by libtool. The documentation has been turned into a man page, so
638 there are now .1, .txt, and .html versions in /doc.
639
640 3. Upgrades to pcregrep:
641 (i) Added long-form option names like gnu grep.
642 (ii) Added --help to list all options with an explanatory phrase.
643 (iii) Added -r, --recursive to recurse into sub-directories.
644 (iv) Added -f, --file to read patterns from a file.
645
646 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
647 script, to force use of CR or LF instead of \n in the source. On non-Unix
648 systems, the value can be set in config.h.
649
650 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
651 absolute limit. Changed the text of the error message to make this clear, and
652 likewise updated the man page.
653
654 6. The limit of 99 on the number of capturing subpatterns has been removed.
655 The new limit is 65535, which I hope will not be a "real" limit.
656
657
658 Release 3.3 01-Aug-00
659 ---------------------
660
661 There is some support for UTF-8 character strings. This is incomplete and
662 experimental. The documentation describes what is and what is not implemented.
663 Otherwise, this is just a bug-fixing release.
664
665
666 Release 3.0 01-Feb-00
667 ---------------------
668
669 1. A "configure" script is now used to configure PCRE for Unix systems. It
670 builds a Makefile, a config.h file, and the pcre-config script.
671
672 2. PCRE is built as a shared library by default.
673
674 3. There is support for POSIX classes such as [:alpha:].
675
676 5. There is an experimental recursion feature.
677
678 ----------------------------------------------------------------------------
679 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
680
681 Please note that there has been a change in the API such that a larger
682 ovector is required at matching time, to provide some additional workspace.
683 The new man page has details. This change was necessary in order to support
684 some of the new functionality in Perl 5.005.
685
686 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
687
688 Another (I hope this is the last!) change has been made to the API for the
689 pcre_compile() function. An additional argument has been added to make it
690 possible to pass over a pointer to character tables built in the current
691 locale by pcre_maketables(). To use the default tables, this new argument
692 should be passed as NULL.
693
694 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
695
696 Yet another (and again I hope this really is the last) change has been made
697 to the API for the pcre_exec() function. An additional argument has been
698 added to make it possible to start the match other than at the start of the
699 subject string. This is important if there are lookbehinds. The new man
700 page has the details, but you just want to convert existing programs, all
701 you need to do is to stick in a new fifth argument to pcre_exec(), with a
702 value of zero. For example, change
703
704 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
705 to
706 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
707
708 ****

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