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Final file tidies (dates) for 8.43 release.
1 News about PCRE releases
2 ------------------------
3
4 Note that this library (now called PCRE1) is now being maintained for bug fixes
5 only. New projects are advised to use the new PCRE2 libraries.
6
7
8 Release 8.43 23-February-2019
9 -----------------------------
10
11 This is a bug-fix release.
12
13
14 Release 8.42 20-March-2018
15 --------------------------
16
17 This is a bug-fix release.
18
19
20 Release 8.41 13-June-2017
21 -------------------------
22
23 This is a bug-fix release.
24
25
26 Release 8.40 11-January-2017
27 ----------------------------
28
29 This is a bug-fix release.
30
31
32 Release 8.39 14-June-2016
33 -------------------------
34
35 Some appropriate PCRE2 JIT improvements have been retro-fitted to PCRE1. Apart
36 from that, this is another bug-fix release. Note that this library (now called
37 PCRE1) is now being maintained for bug fixes only. New projects are advised to
38 use the new PCRE2 libraries.
39
40
41 Release 8.38 23-November-2015
42 -----------------------------
43
44 This is bug-fix release. Note that this library (now called PCRE1) is now being
45 maintained for bug fixes only. New projects are advised to use the new PCRE2
46 libraries.
47
48
49 Release 8.37 28-April-2015
50 --------------------------
51
52 This is bug-fix release. Note that this library (now called PCRE1) is now being
53 maintained for bug fixes only. New projects are advised to use the new PCRE2
54 libraries.
55
56
57 Release 8.36 26-September-2014
58 ------------------------------
59
60 This is primarily a bug-fix release. However, in addition, the Unicode data
61 tables have been updated to Unicode 7.0.0.
62
63
64 Release 8.35 04-April-2014
65 --------------------------
66
67 There have been performance improvements for classes containing non-ASCII
68 characters and the "auto-possessification" feature has been extended. Other
69 minor improvements have been implemented and bugs fixed. There is a new callout
70 feature to enable applications to do detailed stack checks at compile time, to
71 avoid running out of stack for deeply nested parentheses. The JIT compiler has
72 been extended with experimental support for ARM-64, MIPS-64, and PPC-LE.
73
74
75 Release 8.34 15-December-2013
76 -----------------------------
77
78 As well as fixing the inevitable bugs, performance has been improved by
79 refactoring and extending the amount of "auto-possessification" that PCRE does.
80 Other notable changes:
81
82 . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
83 an empty string. If it can, pcretest shows this in its information output.
84
85 . A back reference to a named subpattern when there is more than one of the
86 same name now checks them in the order in which they appear in the pattern.
87 The first one that is set is used for the reference. Previously only the
88 first one was inspected. This change makes PCRE more compatible with Perl.
89
90 . Unicode character properties were updated from Unicode 6.3.0.
91
92 . The character VT has been added to the set of characters that match \s and
93 are generally treated as white space, following this same change in Perl
94 5.18. There is now no difference between "Perl space" and "POSIX space".
95
96 . Perl has changed its handling of \8 and \9. If there is no previously
97 encountered capturing group of those numbers, they are treated as the
98 literal characters 8 and 9 instead of a binary zero followed by the
99 literals. PCRE now does the same.
100
101 . Following Perl, added \o{} to specify codepoints in octal, making it
102 possible to specify values greater than 0777 and also making them
103 unambiguous.
104
105 . In UCP mode, \s was not matching two of the characters that Perl matches,
106 namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
107 were matched by \h.
108
109 . Add JIT support for the 64 bit TileGX architecture.
110
111 . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
112 [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
113 does in Unicode mode.
114
115 . Perl no longer allows group names to start with digits, so I have made this
116 change also in PCRE.
117
118 . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
119 mean "start of word" and "end of word", respectively, as a transition aid.
120
121
122 Release 8.33 28-May-2013
123 --------------------------
124
125 A number of bugs are fixed, and some performance improvements have been made.
126 There are also some new features, of which these are the most important:
127
128 . The behaviour of the backtracking verbs has been rationalized and
129 documented in more detail.
130
131 . JIT now supports callouts and all of the backtracking verbs.
132
133 . Unicode validation has been updated in the light of Unicode Corrigendum #9,
134 which points out that "non characters" are not "characters that may not
135 appear in Unicode strings" but rather "characters that are reserved for
136 internal use and have only local meaning".
137
138 . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
139 creator of a pattern can specify lower (but not higher) limits for the
140 matching process.
141
142 . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
143 the (*UTF) feature, as this could be a security issue.
144
145
146 Release 8.32 30-November-2012
147 -----------------------------
148
149 This release fixes a number of bugs, but also has some new features. These are
150 the highlights:
151
152 . There is now support for 32-bit character strings and UTF-32. Like the
153 16-bit support, this is done by compiling a separate 32-bit library.
154
155 . \X now matches a Unicode extended grapheme cluster.
156
157 . Case-independent matching of Unicode characters that have more than one
158 "other case" now makes all three (or more) characters equivalent. This
159 applies, for example, to Greek Sigma, which has two lowercase versions.
160
161 . Unicode character properties are updated to Unicode 6.2.0.
162
163 . The EBCDIC support, which had decayed, has had a spring clean.
164
165 . A number of JIT optimizations have been added, which give faster JIT
166 execution speed. In addition, a new direct interface to JIT execution is
167 available. This bypasses some of the sanity checks of pcre_exec() to give a
168 noticeable speed-up.
169
170 . A number of issues in pcregrep have been fixed, making it more compatible
171 with GNU grep. In particular, --exclude and --include (and variants) apply
172 to all files now, not just those obtained from scanning a directory
173 recursively. In Windows environments, the default action for directories is
174 now "skip" instead of "read" (which provokes an error).
175
176 . If the --only-matching (-o) option in pcregrep is specified multiple
177 times, each one causes appropriate output. For example, -o1 -o2 outputs the
178 substrings matched by the 1st and 2nd capturing parentheses. A separating
179 string can be specified by --om-separator (default empty).
180
181 . When PCRE is built via Autotools using a version of gcc that has the
182 "visibility" feature, it is used to hide internal library functions that are
183 not part of the public API.
184
185
186 Release 8.31 06-July-2012
187 -------------------------
188
189 This is mainly a bug-fixing release, with a small number of developments:
190
191 . The JIT compiler now supports partial matching and the (*MARK) and
192 (*COMMIT) verbs.
193
194 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
195 pattern.
196
197 . There should be a performance improvement when using the heap instead of the
198 stack for recursion.
199
200 . pcregrep can now be linked with libedit as an alternative to libreadline.
201
202 . pcregrep now has a --file-list option where the list of files to scan is
203 given as a file.
204
205 . pcregrep now recognizes binary files and there are related options.
206
207 . The Unicode tables have been updated to 6.1.0.
208
209 As always, the full list of changes is in the ChangeLog file.
210
211
212 Release 8.30 04-February-2012
213 -----------------------------
214
215 Release 8.30 introduces a major new feature: support for 16-bit character
216 strings, compiled as a separate library. There are a few changes to the
217 8-bit library, in addition to some bug fixes.
218
219 . The pcre_info() function, which has been obsolete for over 10 years, has
220 been removed.
221
222 . When a compiled pattern was saved to a file and later reloaded on a host
223 with different endianness, PCRE used automatically to swap the bytes in some
224 of the data fields. With the advent of the 16-bit library, where more of this
225 swapping is needed, it is no longer done automatically. Instead, the bad
226 endianness is detected and a specific error is given. The user can then call
227 a new function called pcre_pattern_to_host_byte_order() (or an equivalent
228 16-bit function) to do the swap.
229
230 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
231 code points and are now faulted. (They are the so-called "surrogates"
232 that are reserved for coding high values in UTF-16.)
233
234
235 Release 8.21 12-Dec-2011
236 ------------------------
237
238 This is almost entirely a bug-fix release. The only new feature is the ability
239 to obtain the size of the memory used by the JIT compiler.
240
241
242 Release 8.20 21-Oct-2011
243 ------------------------
244
245 The main change in this release is the inclusion of Zoltan Herczeg's
246 just-in-time compiler support, which can be accessed by building PCRE with
247 --enable-jit. Large performance benefits can be had in many situations. 8.20
248 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
249 a number of infelicities and differences from Perl.
250
251
252 Release 8.13 16-Aug-2011
253 ------------------------
254
255 This is mainly a bug-fix release. There has been a lot of internal refactoring.
256 The Unicode tables have been updated. The only new feature in the library is
257 the passing of *MARK information to callouts. Some additions have been made to
258 pcretest to make testing easier and more comprehensive. There is a new option
259 for pcregrep to adjust its internal buffer size.
260
261
262 Release 8.12 15-Jan-2011
263 ------------------------
264
265 This release fixes some bugs in pcregrep, one of which caused the tests to fail
266 on 64-bit big-endian systems. There are no changes to the code of the library.
267
268
269 Release 8.11 10-Dec-2010
270 ------------------------
271
272 A number of bugs in the library and in pcregrep have been fixed. As always, see
273 ChangeLog for details. The following are the non-bug-fix changes:
274
275 . Added --match-limit and --recursion-limit to pcregrep.
276
277 . Added an optional parentheses number to the -o and --only-matching options
278 of pcregrep.
279
280 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
281 \B.
282
283 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
284 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
285
286 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
287 START_OPTIMIZE option, which is now allowed at compile time
288
289
290 Release 8.10 25-Jun-2010
291 ------------------------
292
293 There are two major additions: support for (*MARK) and friends, and the option
294 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
295 opposites) so that they make use of Unicode properties. There are also a number
296 of lesser new features, and several bugs have been fixed. A new option,
297 --line-buffered, has been added to pcregrep, for use when it is connected to
298 pipes.
299
300
301 Release 8.02 19-Mar-2010
302 ------------------------
303
304 Another bug-fix release.
305
306
307 Release 8.01 19-Jan-2010
308 ------------------------
309
310 This is a bug-fix release. Several bugs in the code itself and some bugs and
311 infelicities in the build system have been fixed.
312
313
314 Release 8.00 19-Oct-09
315 ----------------------
316
317 Bugs have been fixed in the library and in pcregrep. There are also some
318 enhancements. Restrictions on patterns used for partial matching have been
319 removed, extra information is given for partial matches, the partial matching
320 process has been improved, and an option to make a partial match override a
321 full match is available. The "study" process has been enhanced by finding a
322 lower bound matching length. Groups with duplicate numbers may now have
323 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
324 different names. The documentation has been revised to reflect these changes.
325 The version number has been expanded to 3 digits as it is clear that the rate
326 of change is not slowing down.
327
328
329 Release 7.9 11-Apr-09
330 ---------------------
331
332 Mostly bugfixes and tidies with just a couple of minor functional additions.
333
334
335 Release 7.8 05-Sep-08
336 ---------------------
337
338 More bug fixes, plus a performance improvement in Unicode character property
339 lookup.
340
341
342 Release 7.7 07-May-08
343 ---------------------
344
345 This is once again mainly a bug-fix release, but there are a couple of new
346 features.
347
348
349 Release 7.6 28-Jan-08
350 ---------------------
351
352 The main reason for having this release so soon after 7.5 is because it fixes a
353 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
354 addition, the CMake configuration files have been brought up to date.
355
356
357 Release 7.5 10-Jan-08
358 ---------------------
359
360 This is mainly a bug-fix release. However the ability to link pcregrep with
361 libz or libbz2 and the ability to link pcretest with libreadline have been
362 added. Also the --line-offsets and --file-offsets options were added to
363 pcregrep.
364
365
366 Release 7.4 21-Sep-07
367 ---------------------
368
369 The only change of specification is the addition of options to control whether
370 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
371 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
372 relocations needed in a shared library. There have also been some documentation
373 updates, in particular, some more information about using CMake to build PCRE
374 has been added to the NON-UNIX-USE file.
375
376
377 Release 7.3 28-Aug-07
378 ---------------------
379
380 Most changes are bug fixes. Some that are not:
381
382 1. There is some support for Perl 5.10's experimental "backtracking control
383 verbs" such as (*PRUNE).
384
385 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
386 restrictive in the strings it accepts.
387
388 3. Checking for potential integer overflow has been made more dynamic, and as a
389 consequence there is no longer a hard limit on the size of a subpattern that
390 has a limited repeat count.
391
392 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
393 no longer advance by two characters instead of one when an unanchored match
394 fails at CRLF if there are explicit CR or LF matches within the pattern.
395 This gets rid of some anomalous effects that previously occurred.
396
397 5. Some PCRE-specific settings for varying the newline options at the start of
398 a pattern have been added.
399
400
401 Release 7.2 19-Jun-07
402 ---------------------
403
404 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
405 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
406 and \V).
407
408 Correction to the notes for 7.1: the note about shared libraries for Windows is
409 wrong. Previously, three libraries were built, but each could function
410 independently. For example, the pcreposix library also included all the
411 functions from the basic pcre library. The change is that the three libraries
412 are no longer independent. They are like the Unix libraries. To use the
413 pcreposix functions, for example, you need to link with both the pcreposix and
414 the basic pcre library.
415
416 Some more features from Perl 5.10 have been added:
417
418 (?-n) and (?+n) relative references for recursion and subroutines.
419
420 (?(-n) and (?(+n) relative references as conditions.
421
422 \k{name} and \g{name} are synonyms for \k<name>.
423
424 \K to reset the start of the matched string; for example, (foo)\Kbar
425 matches bar preceded by foo, but only sets bar as the matched string.
426
427 (?| introduces a group where the capturing parentheses in each alternative
428 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
429 parentheses number 1 in both cases.
430
431 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
432
433
434 Release 7.1 24-Apr-07
435 ---------------------
436
437 There is only one new feature in this release: a linebreak setting of
438 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
439 recognizes only CRLF, CR, and LF as linebreaks.
440
441 A few bugs are fixed (see ChangeLog for details), but the major change is a
442 complete re-implementation of the build system. This now has full Autotools
443 support and so is now "standard" in some sense. It should help with compiling
444 PCRE in a wide variety of environments.
445
446 NOTE: when building shared libraries for Windows, three dlls are now built,
447 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
448 included in a single dll.
449
450 Another important change is that the dftables auxiliary program is no longer
451 compiled and run at "make" time by default. Instead, a default set of character
452 tables (assuming ASCII coding) is used. If you want to use dftables to generate
453 the character tables as previously, add --enable-rebuild-chartables to the
454 "configure" command. You must do this if you are compiling PCRE to run on a
455 system that uses EBCDIC code.
456
457 There is a discussion about character tables in the README file. The default is
458 not to use dftables so that that there is no problem when cross-compiling.
459
460
461 Release 7.0 19-Dec-06
462 ---------------------
463
464 This release has a new major number because there have been some internal
465 upheavals to facilitate the addition of new optimizations and other facilities,
466 and to make subsequent maintenance and extension easier. Compilation is likely
467 to be a bit slower, but there should be no major effect on runtime performance.
468 Previously compiled patterns are NOT upwards compatible with this release. If
469 you have saved compiled patterns from a previous release, you will have to
470 re-compile them. Important changes that are visible to users are:
471
472 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
473 some more scripts.
474
475 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
476 sequence as a newline.
477
478 3. The \R escape matches a single Unicode newline sequence as a single unit.
479
480 4. New features that will appear in Perl 5.10 are now in PCRE. These include
481 alternative Perl syntax for named parentheses, and Perl syntax for
482 recursion.
483
484 5. The C++ wrapper interface has been extended by the addition of a
485 QuoteMeta function and the ability to allow copy construction and
486 assignment.
487
488 For a complete list of changes, see the ChangeLog file.
489
490
491 Release 6.7 04-Jul-06
492 ---------------------
493
494 The main additions to this release are the ability to use the same name for
495 multiple sets of parentheses, and support for CRLF line endings in both the
496 library and pcregrep (and in pcretest for testing).
497
498 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
499 significantly reduced for certain subject strings.
500
501
502 Release 6.5 01-Feb-06
503 ---------------------
504
505 Important changes in this release:
506
507 1. A number of new features have been added to pcregrep.
508
509 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
510 supported properties have been extended with script names such as "Arabic",
511 and the derived properties "Any" and "L&". This has necessitated a change to
512 the interal format of compiled patterns. Any saved compiled patterns that
513 use \p or \P must be recompiled.
514
515 3. The specification of recursion in patterns has been changed so that all
516 recursive subpatterns are automatically treated as atomic groups. Thus, for
517 example, (?R) is treated as if it were (?>(?R)). This is necessary because
518 otherwise there are situations where recursion does not work.
519
520 See the ChangeLog for a complete list of changes, which include a number of bug
521 fixes and tidies.
522
523
524 Release 6.0 07-Jun-05
525 ---------------------
526
527 The release number has been increased to 6.0 because of the addition of several
528 major new pieces of functionality.
529
530 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
531 algorithm, has been added. This has a number of advantages for certain cases,
532 though it does run more slowly, and lacks the ability to capture substrings. On
533 the other hand, it does find all matches, not just the first, and it works
534 better for partial matching. The pcrematching man page discusses the
535 differences.
536
537 The pcretest program has been enhanced so that it can make use of the new
538 pcre_dfa_exec() matching function and the extra features it provides.
539
540 The distribution now includes a C++ wrapper library. This is built
541 automatically if a C++ compiler is found. The pcrecpp man page discusses this
542 interface.
543
544 The code itself has been re-organized into many more files, one for each
545 function, so it no longer requires everything to be linked in when static
546 linkage is used. As a consequence, some internal functions have had to have
547 their names exposed. These functions all have names starting with _pcre_. They
548 are undocumented, and are not intended for use by outside callers.
549
550 The pcregrep program has been enhanced with new functionality such as
551 multiline-matching and options for output more matching context. See the
552 ChangeLog for a complete list of changes to the library and the utility
553 programs.
554
555
556 Release 5.0 13-Sep-04
557 ---------------------
558
559 The licence under which PCRE is released has been changed to the more
560 conventional "BSD" licence.
561
562 In the code, some bugs have been fixed, and there are also some major changes
563 in this release (which is why I've increased the number to 5.0). Some changes
564 are internal rearrangements, and some provide a number of new facilities. The
565 new features are:
566
567 1. There's an "automatic callout" feature that inserts callouts before every
568 item in the regex, and there's a new callout field that gives the position
569 in the pattern - useful for debugging and tracing.
570
571 2. The extra_data structure can now be used to pass in a set of character
572 tables at exec time. This is useful if compiled regex are saved and re-used
573 at a later time when the tables may not be at the same address. If the
574 default internal tables are used, the pointer saved with the compiled
575 pattern is now set to NULL, which means that you don't need to do anything
576 special unless you are using custom tables.
577
578 3. It is possible, with some restrictions on the content of the regex, to
579 request "partial" matching. A special return code is given if all of the
580 subject string matched part of the regex. This could be useful for testing
581 an input field as it is being typed.
582
583 4. There is now some optional support for Unicode character properties, which
584 means that the patterns items such as \p{Lu} and \X can now be used. Only
585 the general category properties are supported. If PCRE is compiled with this
586 support, an additional 90K data structure is include, which increases the
587 size of the library dramatically.
588
589 5. There is support for saving compiled patterns and re-using them later.
590
591 6. There is support for running regular expressions that were compiled on a
592 different host with the opposite endianness.
593
594 7. The pcretest program has been extended to accommodate the new features.
595
596 The main internal rearrangement is that sequences of literal characters are no
597 longer handled as strings. Instead, each character is handled on its own. This
598 makes some UTF-8 handling easier, and makes the support of partial matching
599 possible. Compiled patterns containing long literal strings will be larger as a
600 result of this change; I hope that performance will not be much affected.
601
602
603 Release 4.5 01-Dec-03
604 ---------------------
605
606 Again mainly a bug-fix and tidying release, with only a couple of new features:
607
608 1. It's possible now to compile PCRE so that it does not use recursive
609 function calls when matching. Instead it gets memory from the heap. This slows
610 things down, but may be necessary on systems with limited stacks.
611
612 2. UTF-8 string checking has been tightened to reject overlong sequences and to
613 check that a starting offset points to the start of a character. Failure of the
614 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
615
616 3. PCRE can now be compiled for systems that use EBCDIC code.
617
618
619 Release 4.4 21-Aug-03
620 ---------------------
621
622 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
623 checks UTF-8 strings for validity by default. There is an option to suppress
624 this, just in case anybody wants that teeny extra bit of performance.
625
626
627 Releases 4.1 - 4.3
628 ------------------
629
630 Sorry, I forgot about updating the NEWS file for these releases. Please take a
631 look at ChangeLog.
632
633
634 Release 4.0 17-Feb-03
635 ---------------------
636
637 There have been a lot of changes for the 4.0 release, adding additional
638 functionality and mending bugs. Below is a list of the highlights of the new
639 functionality. For full details of these features, please consult the
640 documentation. For a complete list of changes, see the ChangeLog file.
641
642 1. Support for Perl's \Q...\E escapes.
643
644 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
645 package. They provide some syntactic sugar for simple cases of "atomic
646 grouping".
647
648 3. Support for the \G assertion. It is true when the current matching position
649 is at the start point of the match.
650
651 4. A new feature that provides some of the functionality that Perl provides
652 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
653 is for the caller to provide an optional function, by setting pcre_callout to
654 its entry point. To get the function called, the regex must include (?C) at
655 appropriate points.
656
657 5. Support for recursive calls to individual subpatterns. This makes it really
658 easy to get totally confused.
659
660 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
661 name a group.
662
663 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
664 option for pcregrep to make it operate in UTF-8 mode.
665
666 8. The single man page has been split into a number of separate man pages.
667 These also give rise to individual HTML pages which are put in a separate
668 directory. There is an index.html page that lists them all. Some hyperlinking
669 between the pages has been installed.
670
671
672 Release 3.5 15-Aug-01
673 ---------------------
674
675 1. The configuring system has been upgraded to use later versions of autoconf
676 and libtool. By default it builds both a shared and a static library if the OS
677 supports it. You can use --disable-shared or --disable-static on the configure
678 command if you want only one of them.
679
680 2. The pcretest utility is now installed along with pcregrep because it is
681 useful for users (to test regexs) and by doing this, it automatically gets
682 relinked by libtool. The documentation has been turned into a man page, so
683 there are now .1, .txt, and .html versions in /doc.
684
685 3. Upgrades to pcregrep:
686 (i) Added long-form option names like gnu grep.
687 (ii) Added --help to list all options with an explanatory phrase.
688 (iii) Added -r, --recursive to recurse into sub-directories.
689 (iv) Added -f, --file to read patterns from a file.
690
691 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
692 script, to force use of CR or LF instead of \n in the source. On non-Unix
693 systems, the value can be set in config.h.
694
695 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
696 absolute limit. Changed the text of the error message to make this clear, and
697 likewise updated the man page.
698
699 6. The limit of 99 on the number of capturing subpatterns has been removed.
700 The new limit is 65535, which I hope will not be a "real" limit.
701
702
703 Release 3.3 01-Aug-00
704 ---------------------
705
706 There is some support for UTF-8 character strings. This is incomplete and
707 experimental. The documentation describes what is and what is not implemented.
708 Otherwise, this is just a bug-fixing release.
709
710
711 Release 3.0 01-Feb-00
712 ---------------------
713
714 1. A "configure" script is now used to configure PCRE for Unix systems. It
715 builds a Makefile, a config.h file, and the pcre-config script.
716
717 2. PCRE is built as a shared library by default.
718
719 3. There is support for POSIX classes such as [:alpha:].
720
721 5. There is an experimental recursion feature.
722
723 ----------------------------------------------------------------------------
724 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
725
726 Please note that there has been a change in the API such that a larger
727 ovector is required at matching time, to provide some additional workspace.
728 The new man page has details. This change was necessary in order to support
729 some of the new functionality in Perl 5.005.
730
731 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
732
733 Another (I hope this is the last!) change has been made to the API for the
734 pcre_compile() function. An additional argument has been added to make it
735 possible to pass over a pointer to character tables built in the current
736 locale by pcre_maketables(). To use the default tables, this new argument
737 should be passed as NULL.
738
739 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
740
741 Yet another (and again I hope this really is the last) change has been made
742 to the API for the pcre_exec() function. An additional argument has been
743 added to make it possible to start the match other than at the start of the
744 subject string. This is important if there are lookbehinds. The new man
745 page has the details, but you just want to convert existing programs, all
746 you need to do is to stick in a new fifth argument to pcre_exec(), with a
747 value of zero. For example, change
748
749 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
750 to
751 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
752
753 ****

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