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Final tidies and documentation updates for 8.44.
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 8.44 12-February-2020
9 -----------------------------
10
11 This is a bug-fix release.
12
13
14 Release 8.43 23-February-2019
15 -----------------------------
16
17 This is a bug-fix release.
18
19
20 Release 8.42 20-March-2018
21 --------------------------
22
23 This is a bug-fix release.
24
25
26 Release 8.41 13-June-2017
27 -------------------------
28
29 This is a bug-fix release.
30
31
32 Release 8.40 11-January-2017
33 ----------------------------
34
35 This is a bug-fix release.
36
37
38 Release 8.39 14-June-2016
39 -------------------------
40
41 Some appropriate PCRE2 JIT improvements have been retro-fitted to PCRE1. Apart
42 from that, this is another bug-fix release. Note that this library (now called
43 PCRE1) is now being maintained for bug fixes only. New projects are advised to
44 use the new PCRE2 libraries.
45
46
47 Release 8.38 23-November-2015
48 -----------------------------
49
50 This is bug-fix release. Note that this library (now called PCRE1) is now being
51 maintained for bug fixes only. New projects are advised to use the new PCRE2
52 libraries.
53
54
55 Release 8.37 28-April-2015
56 --------------------------
57
58 This is bug-fix release. Note that this library (now called PCRE1) is now being
59 maintained for bug fixes only. New projects are advised to use the new PCRE2
60 libraries.
61
62
63 Release 8.36 26-September-2014
64 ------------------------------
65
66 This is primarily a bug-fix release. However, in addition, the Unicode data
67 tables have been updated to Unicode 7.0.0.
68
69
70 Release 8.35 04-April-2014
71 --------------------------
72
73 There have been performance improvements for classes containing non-ASCII
74 characters and the "auto-possessification" feature has been extended. Other
75 minor improvements have been implemented and bugs fixed. There is a new callout
76 feature to enable applications to do detailed stack checks at compile time, to
77 avoid running out of stack for deeply nested parentheses. The JIT compiler has
78 been extended with experimental support for ARM-64, MIPS-64, and PPC-LE.
79
80
81 Release 8.34 15-December-2013
82 -----------------------------
83
84 As well as fixing the inevitable bugs, performance has been improved by
85 refactoring and extending the amount of "auto-possessification" that PCRE does.
86 Other notable changes:
87
88 . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
89 an empty string. If it can, pcretest shows this in its information output.
90
91 . A back reference to a named subpattern when there is more than one of the
92 same name now checks them in the order in which they appear in the pattern.
93 The first one that is set is used for the reference. Previously only the
94 first one was inspected. This change makes PCRE more compatible with Perl.
95
96 . Unicode character properties were updated from Unicode 6.3.0.
97
98 . The character VT has been added to the set of characters that match \s and
99 are generally treated as white space, following this same change in Perl
100 5.18. There is now no difference between "Perl space" and "POSIX space".
101
102 . Perl has changed its handling of \8 and \9. If there is no previously
103 encountered capturing group of those numbers, they are treated as the
104 literal characters 8 and 9 instead of a binary zero followed by the
105 literals. PCRE now does the same.
106
107 . Following Perl, added \o{} to specify codepoints in octal, making it
108 possible to specify values greater than 0777 and also making them
109 unambiguous.
110
111 . In UCP mode, \s was not matching two of the characters that Perl matches,
112 namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
113 were matched by \h.
114
115 . Add JIT support for the 64 bit TileGX architecture.
116
117 . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
118 [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
119 does in Unicode mode.
120
121 . Perl no longer allows group names to start with digits, so I have made this
122 change also in PCRE.
123
124 . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
125 mean "start of word" and "end of word", respectively, as a transition aid.
126
127
128 Release 8.33 28-May-2013
129 --------------------------
130
131 A number of bugs are fixed, and some performance improvements have been made.
132 There are also some new features, of which these are the most important:
133
134 . The behaviour of the backtracking verbs has been rationalized and
135 documented in more detail.
136
137 . JIT now supports callouts and all of the backtracking verbs.
138
139 . Unicode validation has been updated in the light of Unicode Corrigendum #9,
140 which points out that "non characters" are not "characters that may not
141 appear in Unicode strings" but rather "characters that are reserved for
142 internal use and have only local meaning".
143
144 . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
145 creator of a pattern can specify lower (but not higher) limits for the
146 matching process.
147
148 . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
149 the (*UTF) feature, as this could be a security issue.
150
151
152 Release 8.32 30-November-2012
153 -----------------------------
154
155 This release fixes a number of bugs, but also has some new features. These are
156 the highlights:
157
158 . There is now support for 32-bit character strings and UTF-32. Like the
159 16-bit support, this is done by compiling a separate 32-bit library.
160
161 . \X now matches a Unicode extended grapheme cluster.
162
163 . Case-independent matching of Unicode characters that have more than one
164 "other case" now makes all three (or more) characters equivalent. This
165 applies, for example, to Greek Sigma, which has two lowercase versions.
166
167 . Unicode character properties are updated to Unicode 6.2.0.
168
169 . The EBCDIC support, which had decayed, has had a spring clean.
170
171 . A number of JIT optimizations have been added, which give faster JIT
172 execution speed. In addition, a new direct interface to JIT execution is
173 available. This bypasses some of the sanity checks of pcre_exec() to give a
174 noticeable speed-up.
175
176 . A number of issues in pcregrep have been fixed, making it more compatible
177 with GNU grep. In particular, --exclude and --include (and variants) apply
178 to all files now, not just those obtained from scanning a directory
179 recursively. In Windows environments, the default action for directories is
180 now "skip" instead of "read" (which provokes an error).
181
182 . If the --only-matching (-o) option in pcregrep is specified multiple
183 times, each one causes appropriate output. For example, -o1 -o2 outputs the
184 substrings matched by the 1st and 2nd capturing parentheses. A separating
185 string can be specified by --om-separator (default empty).
186
187 . When PCRE is built via Autotools using a version of gcc that has the
188 "visibility" feature, it is used to hide internal library functions that are
189 not part of the public API.
190
191
192 Release 8.31 06-July-2012
193 -------------------------
194
195 This is mainly a bug-fixing release, with a small number of developments:
196
197 . The JIT compiler now supports partial matching and the (*MARK) and
198 (*COMMIT) verbs.
199
200 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
201 pattern.
202
203 . There should be a performance improvement when using the heap instead of the
204 stack for recursion.
205
206 . pcregrep can now be linked with libedit as an alternative to libreadline.
207
208 . pcregrep now has a --file-list option where the list of files to scan is
209 given as a file.
210
211 . pcregrep now recognizes binary files and there are related options.
212
213 . The Unicode tables have been updated to 6.1.0.
214
215 As always, the full list of changes is in the ChangeLog file.
216
217
218 Release 8.30 04-February-2012
219 -----------------------------
220
221 Release 8.30 introduces a major new feature: support for 16-bit character
222 strings, compiled as a separate library. There are a few changes to the
223 8-bit library, in addition to some bug fixes.
224
225 . The pcre_info() function, which has been obsolete for over 10 years, has
226 been removed.
227
228 . When a compiled pattern was saved to a file and later reloaded on a host
229 with different endianness, PCRE used automatically to swap the bytes in some
230 of the data fields. With the advent of the 16-bit library, where more of this
231 swapping is needed, it is no longer done automatically. Instead, the bad
232 endianness is detected and a specific error is given. The user can then call
233 a new function called pcre_pattern_to_host_byte_order() (or an equivalent
234 16-bit function) to do the swap.
235
236 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
237 code points and are now faulted. (They are the so-called "surrogates"
238 that are reserved for coding high values in UTF-16.)
239
240
241 Release 8.21 12-Dec-2011
242 ------------------------
243
244 This is almost entirely a bug-fix release. The only new feature is the ability
245 to obtain the size of the memory used by the JIT compiler.
246
247
248 Release 8.20 21-Oct-2011
249 ------------------------
250
251 The main change in this release is the inclusion of Zoltan Herczeg's
252 just-in-time compiler support, which can be accessed by building PCRE with
253 --enable-jit. Large performance benefits can be had in many situations. 8.20
254 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
255 a number of infelicities and differences from Perl.
256
257
258 Release 8.13 16-Aug-2011
259 ------------------------
260
261 This is mainly a bug-fix release. There has been a lot of internal refactoring.
262 The Unicode tables have been updated. The only new feature in the library is
263 the passing of *MARK information to callouts. Some additions have been made to
264 pcretest to make testing easier and more comprehensive. There is a new option
265 for pcregrep to adjust its internal buffer size.
266
267
268 Release 8.12 15-Jan-2011
269 ------------------------
270
271 This release fixes some bugs in pcregrep, one of which caused the tests to fail
272 on 64-bit big-endian systems. There are no changes to the code of the library.
273
274
275 Release 8.11 10-Dec-2010
276 ------------------------
277
278 A number of bugs in the library and in pcregrep have been fixed. As always, see
279 ChangeLog for details. The following are the non-bug-fix changes:
280
281 . Added --match-limit and --recursion-limit to pcregrep.
282
283 . Added an optional parentheses number to the -o and --only-matching options
284 of pcregrep.
285
286 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
287 \B.
288
289 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
290 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
291
292 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
293 START_OPTIMIZE option, which is now allowed at compile time
294
295
296 Release 8.10 25-Jun-2010
297 ------------------------
298
299 There are two major additions: support for (*MARK) and friends, and the option
300 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
301 opposites) so that they make use of Unicode properties. There are also a number
302 of lesser new features, and several bugs have been fixed. A new option,
303 --line-buffered, has been added to pcregrep, for use when it is connected to
304 pipes.
305
306
307 Release 8.02 19-Mar-2010
308 ------------------------
309
310 Another bug-fix release.
311
312
313 Release 8.01 19-Jan-2010
314 ------------------------
315
316 This is a bug-fix release. Several bugs in the code itself and some bugs and
317 infelicities in the build system have been fixed.
318
319
320 Release 8.00 19-Oct-09
321 ----------------------
322
323 Bugs have been fixed in the library and in pcregrep. There are also some
324 enhancements. Restrictions on patterns used for partial matching have been
325 removed, extra information is given for partial matches, the partial matching
326 process has been improved, and an option to make a partial match override a
327 full match is available. The "study" process has been enhanced by finding a
328 lower bound matching length. Groups with duplicate numbers may now have
329 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
330 different names. The documentation has been revised to reflect these changes.
331 The version number has been expanded to 3 digits as it is clear that the rate
332 of change is not slowing down.
333
334
335 Release 7.9 11-Apr-09
336 ---------------------
337
338 Mostly bugfixes and tidies with just a couple of minor functional additions.
339
340
341 Release 7.8 05-Sep-08
342 ---------------------
343
344 More bug fixes, plus a performance improvement in Unicode character property
345 lookup.
346
347
348 Release 7.7 07-May-08
349 ---------------------
350
351 This is once again mainly a bug-fix release, but there are a couple of new
352 features.
353
354
355 Release 7.6 28-Jan-08
356 ---------------------
357
358 The main reason for having this release so soon after 7.5 is because it fixes a
359 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
360 addition, the CMake configuration files have been brought up to date.
361
362
363 Release 7.5 10-Jan-08
364 ---------------------
365
366 This is mainly a bug-fix release. However the ability to link pcregrep with
367 libz or libbz2 and the ability to link pcretest with libreadline have been
368 added. Also the --line-offsets and --file-offsets options were added to
369 pcregrep.
370
371
372 Release 7.4 21-Sep-07
373 ---------------------
374
375 The only change of specification is the addition of options to control whether
376 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
377 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
378 relocations needed in a shared library. There have also been some documentation
379 updates, in particular, some more information about using CMake to build PCRE
380 has been added to the NON-UNIX-USE file.
381
382
383 Release 7.3 28-Aug-07
384 ---------------------
385
386 Most changes are bug fixes. Some that are not:
387
388 1. There is some support for Perl 5.10's experimental "backtracking control
389 verbs" such as (*PRUNE).
390
391 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
392 restrictive in the strings it accepts.
393
394 3. Checking for potential integer overflow has been made more dynamic, and as a
395 consequence there is no longer a hard limit on the size of a subpattern that
396 has a limited repeat count.
397
398 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
399 no longer advance by two characters instead of one when an unanchored match
400 fails at CRLF if there are explicit CR or LF matches within the pattern.
401 This gets rid of some anomalous effects that previously occurred.
402
403 5. Some PCRE-specific settings for varying the newline options at the start of
404 a pattern have been added.
405
406
407 Release 7.2 19-Jun-07
408 ---------------------
409
410 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
411 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
412 and \V).
413
414 Correction to the notes for 7.1: the note about shared libraries for Windows is
415 wrong. Previously, three libraries were built, but each could function
416 independently. For example, the pcreposix library also included all the
417 functions from the basic pcre library. The change is that the three libraries
418 are no longer independent. They are like the Unix libraries. To use the
419 pcreposix functions, for example, you need to link with both the pcreposix and
420 the basic pcre library.
421
422 Some more features from Perl 5.10 have been added:
423
424 (?-n) and (?+n) relative references for recursion and subroutines.
425
426 (?(-n) and (?(+n) relative references as conditions.
427
428 \k{name} and \g{name} are synonyms for \k<name>.
429
430 \K to reset the start of the matched string; for example, (foo)\Kbar
431 matches bar preceded by foo, but only sets bar as the matched string.
432
433 (?| introduces a group where the capturing parentheses in each alternative
434 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
435 parentheses number 1 in both cases.
436
437 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
438
439
440 Release 7.1 24-Apr-07
441 ---------------------
442
443 There is only one new feature in this release: a linebreak setting of
444 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
445 recognizes only CRLF, CR, and LF as linebreaks.
446
447 A few bugs are fixed (see ChangeLog for details), but the major change is a
448 complete re-implementation of the build system. This now has full Autotools
449 support and so is now "standard" in some sense. It should help with compiling
450 PCRE in a wide variety of environments.
451
452 NOTE: when building shared libraries for Windows, three dlls are now built,
453 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
454 included in a single dll.
455
456 Another important change is that the dftables auxiliary program is no longer
457 compiled and run at "make" time by default. Instead, a default set of character
458 tables (assuming ASCII coding) is used. If you want to use dftables to generate
459 the character tables as previously, add --enable-rebuild-chartables to the
460 "configure" command. You must do this if you are compiling PCRE to run on a
461 system that uses EBCDIC code.
462
463 There is a discussion about character tables in the README file. The default is
464 not to use dftables so that that there is no problem when cross-compiling.
465
466
467 Release 7.0 19-Dec-06
468 ---------------------
469
470 This release has a new major number because there have been some internal
471 upheavals to facilitate the addition of new optimizations and other facilities,
472 and to make subsequent maintenance and extension easier. Compilation is likely
473 to be a bit slower, but there should be no major effect on runtime performance.
474 Previously compiled patterns are NOT upwards compatible with this release. If
475 you have saved compiled patterns from a previous release, you will have to
476 re-compile them. Important changes that are visible to users are:
477
478 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
479 some more scripts.
480
481 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
482 sequence as a newline.
483
484 3. The \R escape matches a single Unicode newline sequence as a single unit.
485
486 4. New features that will appear in Perl 5.10 are now in PCRE. These include
487 alternative Perl syntax for named parentheses, and Perl syntax for
488 recursion.
489
490 5. The C++ wrapper interface has been extended by the addition of a
491 QuoteMeta function and the ability to allow copy construction and
492 assignment.
493
494 For a complete list of changes, see the ChangeLog file.
495
496
497 Release 6.7 04-Jul-06
498 ---------------------
499
500 The main additions to this release are the ability to use the same name for
501 multiple sets of parentheses, and support for CRLF line endings in both the
502 library and pcregrep (and in pcretest for testing).
503
504 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
505 significantly reduced for certain subject strings.
506
507
508 Release 6.5 01-Feb-06
509 ---------------------
510
511 Important changes in this release:
512
513 1. A number of new features have been added to pcregrep.
514
515 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
516 supported properties have been extended with script names such as "Arabic",
517 and the derived properties "Any" and "L&". This has necessitated a change to
518 the interal format of compiled patterns. Any saved compiled patterns that
519 use \p or \P must be recompiled.
520
521 3. The specification of recursion in patterns has been changed so that all
522 recursive subpatterns are automatically treated as atomic groups. Thus, for
523 example, (?R) is treated as if it were (?>(?R)). This is necessary because
524 otherwise there are situations where recursion does not work.
525
526 See the ChangeLog for a complete list of changes, which include a number of bug
527 fixes and tidies.
528
529
530 Release 6.0 07-Jun-05
531 ---------------------
532
533 The release number has been increased to 6.0 because of the addition of several
534 major new pieces of functionality.
535
536 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
537 algorithm, has been added. This has a number of advantages for certain cases,
538 though it does run more slowly, and lacks the ability to capture substrings. On
539 the other hand, it does find all matches, not just the first, and it works
540 better for partial matching. The pcrematching man page discusses the
541 differences.
542
543 The pcretest program has been enhanced so that it can make use of the new
544 pcre_dfa_exec() matching function and the extra features it provides.
545
546 The distribution now includes a C++ wrapper library. This is built
547 automatically if a C++ compiler is found. The pcrecpp man page discusses this
548 interface.
549
550 The code itself has been re-organized into many more files, one for each
551 function, so it no longer requires everything to be linked in when static
552 linkage is used. As a consequence, some internal functions have had to have
553 their names exposed. These functions all have names starting with _pcre_. They
554 are undocumented, and are not intended for use by outside callers.
555
556 The pcregrep program has been enhanced with new functionality such as
557 multiline-matching and options for output more matching context. See the
558 ChangeLog for a complete list of changes to the library and the utility
559 programs.
560
561
562 Release 5.0 13-Sep-04
563 ---------------------
564
565 The licence under which PCRE is released has been changed to the more
566 conventional "BSD" licence.
567
568 In the code, some bugs have been fixed, and there are also some major changes
569 in this release (which is why I've increased the number to 5.0). Some changes
570 are internal rearrangements, and some provide a number of new facilities. The
571 new features are:
572
573 1. There's an "automatic callout" feature that inserts callouts before every
574 item in the regex, and there's a new callout field that gives the position
575 in the pattern - useful for debugging and tracing.
576
577 2. The extra_data structure can now be used to pass in a set of character
578 tables at exec time. This is useful if compiled regex are saved and re-used
579 at a later time when the tables may not be at the same address. If the
580 default internal tables are used, the pointer saved with the compiled
581 pattern is now set to NULL, which means that you don't need to do anything
582 special unless you are using custom tables.
583
584 3. It is possible, with some restrictions on the content of the regex, to
585 request "partial" matching. A special return code is given if all of the
586 subject string matched part of the regex. This could be useful for testing
587 an input field as it is being typed.
588
589 4. There is now some optional support for Unicode character properties, which
590 means that the patterns items such as \p{Lu} and \X can now be used. Only
591 the general category properties are supported. If PCRE is compiled with this
592 support, an additional 90K data structure is include, which increases the
593 size of the library dramatically.
594
595 5. There is support for saving compiled patterns and re-using them later.
596
597 6. There is support for running regular expressions that were compiled on a
598 different host with the opposite endianness.
599
600 7. The pcretest program has been extended to accommodate the new features.
601
602 The main internal rearrangement is that sequences of literal characters are no
603 longer handled as strings. Instead, each character is handled on its own. This
604 makes some UTF-8 handling easier, and makes the support of partial matching
605 possible. Compiled patterns containing long literal strings will be larger as a
606 result of this change; I hope that performance will not be much affected.
607
608
609 Release 4.5 01-Dec-03
610 ---------------------
611
612 Again mainly a bug-fix and tidying release, with only a couple of new features:
613
614 1. It's possible now to compile PCRE so that it does not use recursive
615 function calls when matching. Instead it gets memory from the heap. This slows
616 things down, but may be necessary on systems with limited stacks.
617
618 2. UTF-8 string checking has been tightened to reject overlong sequences and to
619 check that a starting offset points to the start of a character. Failure of the
620 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
621
622 3. PCRE can now be compiled for systems that use EBCDIC code.
623
624
625 Release 4.4 21-Aug-03
626 ---------------------
627
628 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
629 checks UTF-8 strings for validity by default. There is an option to suppress
630 this, just in case anybody wants that teeny extra bit of performance.
631
632
633 Releases 4.1 - 4.3
634 ------------------
635
636 Sorry, I forgot about updating the NEWS file for these releases. Please take a
637 look at ChangeLog.
638
639
640 Release 4.0 17-Feb-03
641 ---------------------
642
643 There have been a lot of changes for the 4.0 release, adding additional
644 functionality and mending bugs. Below is a list of the highlights of the new
645 functionality. For full details of these features, please consult the
646 documentation. For a complete list of changes, see the ChangeLog file.
647
648 1. Support for Perl's \Q...\E escapes.
649
650 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
651 package. They provide some syntactic sugar for simple cases of "atomic
652 grouping".
653
654 3. Support for the \G assertion. It is true when the current matching position
655 is at the start point of the match.
656
657 4. A new feature that provides some of the functionality that Perl provides
658 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
659 is for the caller to provide an optional function, by setting pcre_callout to
660 its entry point. To get the function called, the regex must include (?C) at
661 appropriate points.
662
663 5. Support for recursive calls to individual subpatterns. This makes it really
664 easy to get totally confused.
665
666 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
667 name a group.
668
669 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
670 option for pcregrep to make it operate in UTF-8 mode.
671
672 8. The single man page has been split into a number of separate man pages.
673 These also give rise to individual HTML pages which are put in a separate
674 directory. There is an index.html page that lists them all. Some hyperlinking
675 between the pages has been installed.
676
677
678 Release 3.5 15-Aug-01
679 ---------------------
680
681 1. The configuring system has been upgraded to use later versions of autoconf
682 and libtool. By default it builds both a shared and a static library if the OS
683 supports it. You can use --disable-shared or --disable-static on the configure
684 command if you want only one of them.
685
686 2. The pcretest utility is now installed along with pcregrep because it is
687 useful for users (to test regexs) and by doing this, it automatically gets
688 relinked by libtool. The documentation has been turned into a man page, so
689 there are now .1, .txt, and .html versions in /doc.
690
691 3. Upgrades to pcregrep:
692 (i) Added long-form option names like gnu grep.
693 (ii) Added --help to list all options with an explanatory phrase.
694 (iii) Added -r, --recursive to recurse into sub-directories.
695 (iv) Added -f, --file to read patterns from a file.
696
697 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
698 script, to force use of CR or LF instead of \n in the source. On non-Unix
699 systems, the value can be set in config.h.
700
701 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
702 absolute limit. Changed the text of the error message to make this clear, and
703 likewise updated the man page.
704
705 6. The limit of 99 on the number of capturing subpatterns has been removed.
706 The new limit is 65535, which I hope will not be a "real" limit.
707
708
709 Release 3.3 01-Aug-00
710 ---------------------
711
712 There is some support for UTF-8 character strings. This is incomplete and
713 experimental. The documentation describes what is and what is not implemented.
714 Otherwise, this is just a bug-fixing release.
715
716
717 Release 3.0 01-Feb-00
718 ---------------------
719
720 1. A "configure" script is now used to configure PCRE for Unix systems. It
721 builds a Makefile, a config.h file, and the pcre-config script.
722
723 2. PCRE is built as a shared library by default.
724
725 3. There is support for POSIX classes such as [:alpha:].
726
727 5. There is an experimental recursion feature.
728
729 ----------------------------------------------------------------------------
730 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
731
732 Please note that there has been a change in the API such that a larger
733 ovector is required at matching time, to provide some additional workspace.
734 The new man page has details. This change was necessary in order to support
735 some of the new functionality in Perl 5.005.
736
737 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
738
739 Another (I hope this is the last!) change has been made to the API for the
740 pcre_compile() function. An additional argument has been added to make it
741 possible to pass over a pointer to character tables built in the current
742 locale by pcre_maketables(). To use the default tables, this new argument
743 should be passed as NULL.
744
745 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
746
747 Yet another (and again I hope this really is the last) change has been made
748 to the API for the pcre_exec() function. An additional argument has been
749 added to make it possible to start the match other than at the start of the
750 subject string. This is important if there are lookbehinds. The new man
751 page has the details, but you just want to convert existing programs, all
752 you need to do is to stick in a new fifth argument to pcre_exec(), with a
753 value of zero. For example, change
754
755 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
756 to
757 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
758
759 ****

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