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Revision 1703 - (show annotations)
Tue Jun 13 16:53:16 2017 UTC (2 years, 3 months ago) by ph10
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File tidies for 8.41-RC1 release.
1 News about PCRE releases
2 ------------------------
3
4 Release 8.41 13-June-2017
5 -------------------------
6
7 This is a bug-fix release.
8
9
10 Release 8.40 11-January-2017
11 ----------------------------
12
13 This is a bug-fix release.
14
15
16 Release 8.39 14-June-2016
17 -------------------------
18
19 Some appropriate PCRE2 JIT improvements have been retro-fitted to PCRE1. Apart
20 from that, this is another bug-fix release. Note that this library (now called
21 PCRE1) is now being maintained for bug fixes only. New projects are advised to
22 use the new PCRE2 libraries.
23
24
25 Release 8.38 23-November-2015
26 -----------------------------
27
28 This is bug-fix release. Note that this library (now called PCRE1) is now being
29 maintained for bug fixes only. New projects are advised to use the new PCRE2
30 libraries.
31
32
33 Release 8.37 28-April-2015
34 --------------------------
35
36 This is bug-fix release. Note that this library (now called PCRE1) is now being
37 maintained for bug fixes only. New projects are advised to use the new PCRE2
38 libraries.
39
40
41 Release 8.36 26-September-2014
42 ------------------------------
43
44 This is primarily a bug-fix release. However, in addition, the Unicode data
45 tables have been updated to Unicode 7.0.0.
46
47
48 Release 8.35 04-April-2014
49 --------------------------
50
51 There have been performance improvements for classes containing non-ASCII
52 characters and the "auto-possessification" feature has been extended. Other
53 minor improvements have been implemented and bugs fixed. There is a new callout
54 feature to enable applications to do detailed stack checks at compile time, to
55 avoid running out of stack for deeply nested parentheses. The JIT compiler has
56 been extended with experimental support for ARM-64, MIPS-64, and PPC-LE.
57
58
59 Release 8.34 15-December-2013
60 -----------------------------
61
62 As well as fixing the inevitable bugs, performance has been improved by
63 refactoring and extending the amount of "auto-possessification" that PCRE does.
64 Other notable changes:
65
66 . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
67 an empty string. If it can, pcretest shows this in its information output.
68
69 . A back reference to a named subpattern when there is more than one of the
70 same name now checks them in the order in which they appear in the pattern.
71 The first one that is set is used for the reference. Previously only the
72 first one was inspected. This change makes PCRE more compatible with Perl.
73
74 . Unicode character properties were updated from Unicode 6.3.0.
75
76 . The character VT has been added to the set of characters that match \s and
77 are generally treated as white space, following this same change in Perl
78 5.18. There is now no difference between "Perl space" and "POSIX space".
79
80 . Perl has changed its handling of \8 and \9. If there is no previously
81 encountered capturing group of those numbers, they are treated as the
82 literal characters 8 and 9 instead of a binary zero followed by the
83 literals. PCRE now does the same.
84
85 . Following Perl, added \o{} to specify codepoints in octal, making it
86 possible to specify values greater than 0777 and also making them
87 unambiguous.
88
89 . In UCP mode, \s was not matching two of the characters that Perl matches,
90 namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
91 were matched by \h.
92
93 . Add JIT support for the 64 bit TileGX architecture.
94
95 . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
96 [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
97 does in Unicode mode.
98
99 . Perl no longer allows group names to start with digits, so I have made this
100 change also in PCRE.
101
102 . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
103 mean "start of word" and "end of word", respectively, as a transition aid.
104
105
106 Release 8.33 28-May-2013
107 --------------------------
108
109 A number of bugs are fixed, and some performance improvements have been made.
110 There are also some new features, of which these are the most important:
111
112 . The behaviour of the backtracking verbs has been rationalized and
113 documented in more detail.
114
115 . JIT now supports callouts and all of the backtracking verbs.
116
117 . Unicode validation has been updated in the light of Unicode Corrigendum #9,
118 which points out that "non characters" are not "characters that may not
119 appear in Unicode strings" but rather "characters that are reserved for
120 internal use and have only local meaning".
121
122 . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
123 creator of a pattern can specify lower (but not higher) limits for the
124 matching process.
125
126 . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
127 the (*UTF) feature, as this could be a security issue.
128
129
130 Release 8.32 30-November-2012
131 -----------------------------
132
133 This release fixes a number of bugs, but also has some new features. These are
134 the highlights:
135
136 . There is now support for 32-bit character strings and UTF-32. Like the
137 16-bit support, this is done by compiling a separate 32-bit library.
138
139 . \X now matches a Unicode extended grapheme cluster.
140
141 . Case-independent matching of Unicode characters that have more than one
142 "other case" now makes all three (or more) characters equivalent. This
143 applies, for example, to Greek Sigma, which has two lowercase versions.
144
145 . Unicode character properties are updated to Unicode 6.2.0.
146
147 . The EBCDIC support, which had decayed, has had a spring clean.
148
149 . A number of JIT optimizations have been added, which give faster JIT
150 execution speed. In addition, a new direct interface to JIT execution is
151 available. This bypasses some of the sanity checks of pcre_exec() to give a
152 noticeable speed-up.
153
154 . A number of issues in pcregrep have been fixed, making it more compatible
155 with GNU grep. In particular, --exclude and --include (and variants) apply
156 to all files now, not just those obtained from scanning a directory
157 recursively. In Windows environments, the default action for directories is
158 now "skip" instead of "read" (which provokes an error).
159
160 . If the --only-matching (-o) option in pcregrep is specified multiple
161 times, each one causes appropriate output. For example, -o1 -o2 outputs the
162 substrings matched by the 1st and 2nd capturing parentheses. A separating
163 string can be specified by --om-separator (default empty).
164
165 . When PCRE is built via Autotools using a version of gcc that has the
166 "visibility" feature, it is used to hide internal library functions that are
167 not part of the public API.
168
169
170 Release 8.31 06-July-2012
171 -------------------------
172
173 This is mainly a bug-fixing release, with a small number of developments:
174
175 . The JIT compiler now supports partial matching and the (*MARK) and
176 (*COMMIT) verbs.
177
178 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
179 pattern.
180
181 . There should be a performance improvement when using the heap instead of the
182 stack for recursion.
183
184 . pcregrep can now be linked with libedit as an alternative to libreadline.
185
186 . pcregrep now has a --file-list option where the list of files to scan is
187 given as a file.
188
189 . pcregrep now recognizes binary files and there are related options.
190
191 . The Unicode tables have been updated to 6.1.0.
192
193 As always, the full list of changes is in the ChangeLog file.
194
195
196 Release 8.30 04-February-2012
197 -----------------------------
198
199 Release 8.30 introduces a major new feature: support for 16-bit character
200 strings, compiled as a separate library. There are a few changes to the
201 8-bit library, in addition to some bug fixes.
202
203 . The pcre_info() function, which has been obsolete for over 10 years, has
204 been removed.
205
206 . When a compiled pattern was saved to a file and later reloaded on a host
207 with different endianness, PCRE used automatically to swap the bytes in some
208 of the data fields. With the advent of the 16-bit library, where more of this
209 swapping is needed, it is no longer done automatically. Instead, the bad
210 endianness is detected and a specific error is given. The user can then call
211 a new function called pcre_pattern_to_host_byte_order() (or an equivalent
212 16-bit function) to do the swap.
213
214 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
215 code points and are now faulted. (They are the so-called "surrogates"
216 that are reserved for coding high values in UTF-16.)
217
218
219 Release 8.21 12-Dec-2011
220 ------------------------
221
222 This is almost entirely a bug-fix release. The only new feature is the ability
223 to obtain the size of the memory used by the JIT compiler.
224
225
226 Release 8.20 21-Oct-2011
227 ------------------------
228
229 The main change in this release is the inclusion of Zoltan Herczeg's
230 just-in-time compiler support, which can be accessed by building PCRE with
231 --enable-jit. Large performance benefits can be had in many situations. 8.20
232 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
233 a number of infelicities and differences from Perl.
234
235
236 Release 8.13 16-Aug-2011
237 ------------------------
238
239 This is mainly a bug-fix release. There has been a lot of internal refactoring.
240 The Unicode tables have been updated. The only new feature in the library is
241 the passing of *MARK information to callouts. Some additions have been made to
242 pcretest to make testing easier and more comprehensive. There is a new option
243 for pcregrep to adjust its internal buffer size.
244
245
246 Release 8.12 15-Jan-2011
247 ------------------------
248
249 This release fixes some bugs in pcregrep, one of which caused the tests to fail
250 on 64-bit big-endian systems. There are no changes to the code of the library.
251
252
253 Release 8.11 10-Dec-2010
254 ------------------------
255
256 A number of bugs in the library and in pcregrep have been fixed. As always, see
257 ChangeLog for details. The following are the non-bug-fix changes:
258
259 . Added --match-limit and --recursion-limit to pcregrep.
260
261 . Added an optional parentheses number to the -o and --only-matching options
262 of pcregrep.
263
264 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
265 \B.
266
267 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
268 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
269
270 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
271 START_OPTIMIZE option, which is now allowed at compile time
272
273
274 Release 8.10 25-Jun-2010
275 ------------------------
276
277 There are two major additions: support for (*MARK) and friends, and the option
278 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
279 opposites) so that they make use of Unicode properties. There are also a number
280 of lesser new features, and several bugs have been fixed. A new option,
281 --line-buffered, has been added to pcregrep, for use when it is connected to
282 pipes.
283
284
285 Release 8.02 19-Mar-2010
286 ------------------------
287
288 Another bug-fix release.
289
290
291 Release 8.01 19-Jan-2010
292 ------------------------
293
294 This is a bug-fix release. Several bugs in the code itself and some bugs and
295 infelicities in the build system have been fixed.
296
297
298 Release 8.00 19-Oct-09
299 ----------------------
300
301 Bugs have been fixed in the library and in pcregrep. There are also some
302 enhancements. Restrictions on patterns used for partial matching have been
303 removed, extra information is given for partial matches, the partial matching
304 process has been improved, and an option to make a partial match override a
305 full match is available. The "study" process has been enhanced by finding a
306 lower bound matching length. Groups with duplicate numbers may now have
307 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
308 different names. The documentation has been revised to reflect these changes.
309 The version number has been expanded to 3 digits as it is clear that the rate
310 of change is not slowing down.
311
312
313 Release 7.9 11-Apr-09
314 ---------------------
315
316 Mostly bugfixes and tidies with just a couple of minor functional additions.
317
318
319 Release 7.8 05-Sep-08
320 ---------------------
321
322 More bug fixes, plus a performance improvement in Unicode character property
323 lookup.
324
325
326 Release 7.7 07-May-08
327 ---------------------
328
329 This is once again mainly a bug-fix release, but there are a couple of new
330 features.
331
332
333 Release 7.6 28-Jan-08
334 ---------------------
335
336 The main reason for having this release so soon after 7.5 is because it fixes a
337 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
338 addition, the CMake configuration files have been brought up to date.
339
340
341 Release 7.5 10-Jan-08
342 ---------------------
343
344 This is mainly a bug-fix release. However the ability to link pcregrep with
345 libz or libbz2 and the ability to link pcretest with libreadline have been
346 added. Also the --line-offsets and --file-offsets options were added to
347 pcregrep.
348
349
350 Release 7.4 21-Sep-07
351 ---------------------
352
353 The only change of specification is the addition of options to control whether
354 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
355 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
356 relocations needed in a shared library. There have also been some documentation
357 updates, in particular, some more information about using CMake to build PCRE
358 has been added to the NON-UNIX-USE file.
359
360
361 Release 7.3 28-Aug-07
362 ---------------------
363
364 Most changes are bug fixes. Some that are not:
365
366 1. There is some support for Perl 5.10's experimental "backtracking control
367 verbs" such as (*PRUNE).
368
369 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
370 restrictive in the strings it accepts.
371
372 3. Checking for potential integer overflow has been made more dynamic, and as a
373 consequence there is no longer a hard limit on the size of a subpattern that
374 has a limited repeat count.
375
376 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
377 no longer advance by two characters instead of one when an unanchored match
378 fails at CRLF if there are explicit CR or LF matches within the pattern.
379 This gets rid of some anomalous effects that previously occurred.
380
381 5. Some PCRE-specific settings for varying the newline options at the start of
382 a pattern have been added.
383
384
385 Release 7.2 19-Jun-07
386 ---------------------
387
388 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
389 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
390 and \V).
391
392 Correction to the notes for 7.1: the note about shared libraries for Windows is
393 wrong. Previously, three libraries were built, but each could function
394 independently. For example, the pcreposix library also included all the
395 functions from the basic pcre library. The change is that the three libraries
396 are no longer independent. They are like the Unix libraries. To use the
397 pcreposix functions, for example, you need to link with both the pcreposix and
398 the basic pcre library.
399
400 Some more features from Perl 5.10 have been added:
401
402 (?-n) and (?+n) relative references for recursion and subroutines.
403
404 (?(-n) and (?(+n) relative references as conditions.
405
406 \k{name} and \g{name} are synonyms for \k<name>.
407
408 \K to reset the start of the matched string; for example, (foo)\Kbar
409 matches bar preceded by foo, but only sets bar as the matched string.
410
411 (?| introduces a group where the capturing parentheses in each alternative
412 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
413 parentheses number 1 in both cases.
414
415 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
416
417
418 Release 7.1 24-Apr-07
419 ---------------------
420
421 There is only one new feature in this release: a linebreak setting of
422 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
423 recognizes only CRLF, CR, and LF as linebreaks.
424
425 A few bugs are fixed (see ChangeLog for details), but the major change is a
426 complete re-implementation of the build system. This now has full Autotools
427 support and so is now "standard" in some sense. It should help with compiling
428 PCRE in a wide variety of environments.
429
430 NOTE: when building shared libraries for Windows, three dlls are now built,
431 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
432 included in a single dll.
433
434 Another important change is that the dftables auxiliary program is no longer
435 compiled and run at "make" time by default. Instead, a default set of character
436 tables (assuming ASCII coding) is used. If you want to use dftables to generate
437 the character tables as previously, add --enable-rebuild-chartables to the
438 "configure" command. You must do this if you are compiling PCRE to run on a
439 system that uses EBCDIC code.
440
441 There is a discussion about character tables in the README file. The default is
442 not to use dftables so that that there is no problem when cross-compiling.
443
444
445 Release 7.0 19-Dec-06
446 ---------------------
447
448 This release has a new major number because there have been some internal
449 upheavals to facilitate the addition of new optimizations and other facilities,
450 and to make subsequent maintenance and extension easier. Compilation is likely
451 to be a bit slower, but there should be no major effect on runtime performance.
452 Previously compiled patterns are NOT upwards compatible with this release. If
453 you have saved compiled patterns from a previous release, you will have to
454 re-compile them. Important changes that are visible to users are:
455
456 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
457 some more scripts.
458
459 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
460 sequence as a newline.
461
462 3. The \R escape matches a single Unicode newline sequence as a single unit.
463
464 4. New features that will appear in Perl 5.10 are now in PCRE. These include
465 alternative Perl syntax for named parentheses, and Perl syntax for
466 recursion.
467
468 5. The C++ wrapper interface has been extended by the addition of a
469 QuoteMeta function and the ability to allow copy construction and
470 assignment.
471
472 For a complete list of changes, see the ChangeLog file.
473
474
475 Release 6.7 04-Jul-06
476 ---------------------
477
478 The main additions to this release are the ability to use the same name for
479 multiple sets of parentheses, and support for CRLF line endings in both the
480 library and pcregrep (and in pcretest for testing).
481
482 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
483 significantly reduced for certain subject strings.
484
485
486 Release 6.5 01-Feb-06
487 ---------------------
488
489 Important changes in this release:
490
491 1. A number of new features have been added to pcregrep.
492
493 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
494 supported properties have been extended with script names such as "Arabic",
495 and the derived properties "Any" and "L&". This has necessitated a change to
496 the interal format of compiled patterns. Any saved compiled patterns that
497 use \p or \P must be recompiled.
498
499 3. The specification of recursion in patterns has been changed so that all
500 recursive subpatterns are automatically treated as atomic groups. Thus, for
501 example, (?R) is treated as if it were (?>(?R)). This is necessary because
502 otherwise there are situations where recursion does not work.
503
504 See the ChangeLog for a complete list of changes, which include a number of bug
505 fixes and tidies.
506
507
508 Release 6.0 07-Jun-05
509 ---------------------
510
511 The release number has been increased to 6.0 because of the addition of several
512 major new pieces of functionality.
513
514 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
515 algorithm, has been added. This has a number of advantages for certain cases,
516 though it does run more slowly, and lacks the ability to capture substrings. On
517 the other hand, it does find all matches, not just the first, and it works
518 better for partial matching. The pcrematching man page discusses the
519 differences.
520
521 The pcretest program has been enhanced so that it can make use of the new
522 pcre_dfa_exec() matching function and the extra features it provides.
523
524 The distribution now includes a C++ wrapper library. This is built
525 automatically if a C++ compiler is found. The pcrecpp man page discusses this
526 interface.
527
528 The code itself has been re-organized into many more files, one for each
529 function, so it no longer requires everything to be linked in when static
530 linkage is used. As a consequence, some internal functions have had to have
531 their names exposed. These functions all have names starting with _pcre_. They
532 are undocumented, and are not intended for use by outside callers.
533
534 The pcregrep program has been enhanced with new functionality such as
535 multiline-matching and options for output more matching context. See the
536 ChangeLog for a complete list of changes to the library and the utility
537 programs.
538
539
540 Release 5.0 13-Sep-04
541 ---------------------
542
543 The licence under which PCRE is released has been changed to the more
544 conventional "BSD" licence.
545
546 In the code, some bugs have been fixed, and there are also some major changes
547 in this release (which is why I've increased the number to 5.0). Some changes
548 are internal rearrangements, and some provide a number of new facilities. The
549 new features are:
550
551 1. There's an "automatic callout" feature that inserts callouts before every
552 item in the regex, and there's a new callout field that gives the position
553 in the pattern - useful for debugging and tracing.
554
555 2. The extra_data structure can now be used to pass in a set of character
556 tables at exec time. This is useful if compiled regex are saved and re-used
557 at a later time when the tables may not be at the same address. If the
558 default internal tables are used, the pointer saved with the compiled
559 pattern is now set to NULL, which means that you don't need to do anything
560 special unless you are using custom tables.
561
562 3. It is possible, with some restrictions on the content of the regex, to
563 request "partial" matching. A special return code is given if all of the
564 subject string matched part of the regex. This could be useful for testing
565 an input field as it is being typed.
566
567 4. There is now some optional support for Unicode character properties, which
568 means that the patterns items such as \p{Lu} and \X can now be used. Only
569 the general category properties are supported. If PCRE is compiled with this
570 support, an additional 90K data structure is include, which increases the
571 size of the library dramatically.
572
573 5. There is support for saving compiled patterns and re-using them later.
574
575 6. There is support for running regular expressions that were compiled on a
576 different host with the opposite endianness.
577
578 7. The pcretest program has been extended to accommodate the new features.
579
580 The main internal rearrangement is that sequences of literal characters are no
581 longer handled as strings. Instead, each character is handled on its own. This
582 makes some UTF-8 handling easier, and makes the support of partial matching
583 possible. Compiled patterns containing long literal strings will be larger as a
584 result of this change; I hope that performance will not be much affected.
585
586
587 Release 4.5 01-Dec-03
588 ---------------------
589
590 Again mainly a bug-fix and tidying release, with only a couple of new features:
591
592 1. It's possible now to compile PCRE so that it does not use recursive
593 function calls when matching. Instead it gets memory from the heap. This slows
594 things down, but may be necessary on systems with limited stacks.
595
596 2. UTF-8 string checking has been tightened to reject overlong sequences and to
597 check that a starting offset points to the start of a character. Failure of the
598 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
599
600 3. PCRE can now be compiled for systems that use EBCDIC code.
601
602
603 Release 4.4 21-Aug-03
604 ---------------------
605
606 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
607 checks UTF-8 strings for validity by default. There is an option to suppress
608 this, just in case anybody wants that teeny extra bit of performance.
609
610
611 Releases 4.1 - 4.3
612 ------------------
613
614 Sorry, I forgot about updating the NEWS file for these releases. Please take a
615 look at ChangeLog.
616
617
618 Release 4.0 17-Feb-03
619 ---------------------
620
621 There have been a lot of changes for the 4.0 release, adding additional
622 functionality and mending bugs. Below is a list of the highlights of the new
623 functionality. For full details of these features, please consult the
624 documentation. For a complete list of changes, see the ChangeLog file.
625
626 1. Support for Perl's \Q...\E escapes.
627
628 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
629 package. They provide some syntactic sugar for simple cases of "atomic
630 grouping".
631
632 3. Support for the \G assertion. It is true when the current matching position
633 is at the start point of the match.
634
635 4. A new feature that provides some of the functionality that Perl provides
636 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
637 is for the caller to provide an optional function, by setting pcre_callout to
638 its entry point. To get the function called, the regex must include (?C) at
639 appropriate points.
640
641 5. Support for recursive calls to individual subpatterns. This makes it really
642 easy to get totally confused.
643
644 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
645 name a group.
646
647 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
648 option for pcregrep to make it operate in UTF-8 mode.
649
650 8. The single man page has been split into a number of separate man pages.
651 These also give rise to individual HTML pages which are put in a separate
652 directory. There is an index.html page that lists them all. Some hyperlinking
653 between the pages has been installed.
654
655
656 Release 3.5 15-Aug-01
657 ---------------------
658
659 1. The configuring system has been upgraded to use later versions of autoconf
660 and libtool. By default it builds both a shared and a static library if the OS
661 supports it. You can use --disable-shared or --disable-static on the configure
662 command if you want only one of them.
663
664 2. The pcretest utility is now installed along with pcregrep because it is
665 useful for users (to test regexs) and by doing this, it automatically gets
666 relinked by libtool. The documentation has been turned into a man page, so
667 there are now .1, .txt, and .html versions in /doc.
668
669 3. Upgrades to pcregrep:
670 (i) Added long-form option names like gnu grep.
671 (ii) Added --help to list all options with an explanatory phrase.
672 (iii) Added -r, --recursive to recurse into sub-directories.
673 (iv) Added -f, --file to read patterns from a file.
674
675 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
676 script, to force use of CR or LF instead of \n in the source. On non-Unix
677 systems, the value can be set in config.h.
678
679 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
680 absolute limit. Changed the text of the error message to make this clear, and
681 likewise updated the man page.
682
683 6. The limit of 99 on the number of capturing subpatterns has been removed.
684 The new limit is 65535, which I hope will not be a "real" limit.
685
686
687 Release 3.3 01-Aug-00
688 ---------------------
689
690 There is some support for UTF-8 character strings. This is incomplete and
691 experimental. The documentation describes what is and what is not implemented.
692 Otherwise, this is just a bug-fixing release.
693
694
695 Release 3.0 01-Feb-00
696 ---------------------
697
698 1. A "configure" script is now used to configure PCRE for Unix systems. It
699 builds a Makefile, a config.h file, and the pcre-config script.
700
701 2. PCRE is built as a shared library by default.
702
703 3. There is support for POSIX classes such as [:alpha:].
704
705 5. There is an experimental recursion feature.
706
707 ----------------------------------------------------------------------------
708 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
709
710 Please note that there has been a change in the API such that a larger
711 ovector is required at matching time, to provide some additional workspace.
712 The new man page has details. This change was necessary in order to support
713 some of the new functionality in Perl 5.005.
714
715 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
716
717 Another (I hope this is the last!) change has been made to the API for the
718 pcre_compile() function. An additional argument has been added to make it
719 possible to pass over a pointer to character tables built in the current
720 locale by pcre_maketables(). To use the default tables, this new argument
721 should be passed as NULL.
722
723 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
724
725 Yet another (and again I hope this really is the last) change has been made
726 to the API for the pcre_exec() function. An additional argument has been
727 added to make it possible to start the match other than at the start of the
728 subject string. This is important if there are lookbehinds. The new man
729 page has the details, but you just want to convert existing programs, all
730 you need to do is to stick in a new fifth argument to pcre_exec(), with a
731 value of zero. For example, change
732
733 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
734 to
735 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
736
737 ****

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