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Revision 1548 - (hide annotations) (download)
Tue Apr 14 17:02:30 2015 UTC (11 days, 6 hours ago) by ph10
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Documentation and tidies preparatory to 8.37 release.

1 nigel 41 News about PCRE releases
2     ------------------------
3    
4 ph10 1548 Release 8.37 14-April-2015
5     --------------------------
6    
7     This is bug-fix release. Note that this library (now called PCRE1) is now being
8     maintained for bug fixes only. New projects are advised to use the new PCRE2
9     libraries.
10    
11    
12 ph10 1504 Release 8.36 26-September-2014
13 ph10 1502 ------------------------------
14    
15     This is primarily a bug-fix release. However, in addition, the Unicode data
16     tables have been updated to Unicode 7.0.0.
17    
18    
19 ph10 1470 Release 8.35 04-April-2014
20 ph10 1459 --------------------------
21    
22     There have been performance improvements for classes containing non-ASCII
23     characters and the "auto-possessification" feature has been extended. Other
24     minor improvements have been implemented and bugs fixed. There is a new callout
25     feature to enable applications to do detailed stack checks at compile time, to
26 ph10 1465 avoid running out of stack for deeply nested parentheses. The JIT compiler has
27     been extended with experimental support for ARM-64, MIPS-64, and PPC-LE.
28 ph10 1459
29    
30 ph10 1412 Release 8.34 15-December-2013
31 ph10 1404 -----------------------------
32    
33     As well as fixing the inevitable bugs, performance has been improved by
34     refactoring and extending the amount of "auto-possessification" that PCRE does.
35     Other notable changes:
36    
37     . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
38     an empty string. If it can, pcretest shows this in its information output.
39    
40     . A back reference to a named subpattern when there is more than one of the
41     same name now checks them in the order in which they appear in the pattern.
42     The first one that is set is used for the reference. Previously only the
43     first one was inspected. This change makes PCRE more compatible with Perl.
44    
45     . Unicode character properties were updated from Unicode 6.3.0.
46    
47     . The character VT has been added to the set of characters that match \s and
48     are generally treated as white space, following this same change in Perl
49     5.18. There is now no difference between "Perl space" and "POSIX space".
50    
51     . Perl has changed its handling of \8 and \9. If there is no previously
52     encountered capturing group of those numbers, they are treated as the
53     literal characters 8 and 9 instead of a binary zero followed by the
54     literals. PCRE now does the same.
55    
56     . Following Perl, added \o{} to specify codepoints in octal, making it
57     possible to specify values greater than 0777 and also making them
58     unambiguous.
59    
60     . In UCP mode, \s was not matching two of the characters that Perl matches,
61     namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
62     were matched by \h.
63    
64     . Add JIT support for the 64 bit TileGX architecture.
65    
66     . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
67     [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
68     does in Unicode mode.
69    
70     . Perl no longer allows group names to start with digits, so I have made this
71     change also in PCRE.
72    
73 ph10 1412 . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
74     mean "start of word" and "end of word", respectively, as a transition aid.
75 ph10 1404
76 ph10 1412
77 ph10 1335 Release 8.33 28-May-2013
78 ph10 1319 --------------------------
79    
80 ph10 1320 A number of bugs are fixed, and some performance improvements have been made.
81 ph10 1319 There are also some new features, of which these are the most important:
82    
83 ph10 1320 . The behaviour of the backtracking verbs has been rationalized and
84 ph10 1319 documented in more detail.
85    
86     . JIT now supports callouts and all of the backtracking verbs.
87    
88     . Unicode validation has been updated in the light of Unicode Corrigendum #9,
89 ph10 1320 which points out that "non characters" are not "characters that may not
90     appear in Unicode strings" but rather "characters that are reserved for
91 ph10 1319 internal use and have only local meaning".
92 ph10 1320
93     . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
94     creator of a pattern can specify lower (but not higher) limits for the
95 ph10 1319 matching process.
96 ph10 1320
97 ph10 1319 . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
98 ph10 1320 the (*UTF) feature, as this could be a security issue.
99 ph10 1319
100    
101 ph10 1227 Release 8.32 30-November-2012
102 ph10 1217 -----------------------------
103 ph10 1003
104 ph10 1208 This release fixes a number of bugs, but also has some new features. These are
105     the highlights:
106    
107 ph10 1221 . There is now support for 32-bit character strings and UTF-32. Like the
108 ph10 1217 16-bit support, this is done by compiling a separate 32-bit library.
109 ph10 1208
110 ph10 1221 . \X now matches a Unicode extended grapheme cluster.
111 ph10 1208
112     . Case-independent matching of Unicode characters that have more than one
113 ph10 1221 "other case" now makes all three (or more) characters equivalent. This
114 ph10 1208 applies, for example, to Greek Sigma, which has two lowercase versions.
115    
116 ph10 1221 . Unicode character properties are updated to Unicode 6.2.0.
117    
118 ph10 1208 . The EBCDIC support, which had decayed, has had a spring clean.
119    
120 ph10 1221 . A number of JIT optimizations have been added, which give faster JIT
121 ph10 1208 execution speed. In addition, a new direct interface to JIT execution is
122 ph10 1221 available. This bypasses some of the sanity checks of pcre_exec() to give a
123 ph10 1208 noticeable speed-up.
124    
125 ph10 1003 . A number of issues in pcregrep have been fixed, making it more compatible
126 ph10 1221 with GNU grep. In particular, --exclude and --include (and variants) apply
127     to all files now, not just those obtained from scanning a directory
128 ph10 1003 recursively. In Windows environments, the default action for directories is
129     now "skip" instead of "read" (which provokes an error).
130 ph10 1221
131 ph10 1208 . If the --only-matching (-o) option in pcregrep is specified multiple
132 ph10 1221 times, each one causes appropriate output. For example, -o1 -o2 outputs the
133     substrings matched by the 1st and 2nd capturing parentheses. A separating
134     string can be specified by --om-separator (default empty).
135    
136     . When PCRE is built via Autotools using a version of gcc that has the
137 ph10 1208 "visibility" feature, it is used to hide internal library functions that are
138     not part of the public API.
139 ph10 1003
140 ph10 1221
141 ph10 984 Release 8.31 06-July-2012
142 ph10 975 -------------------------
143    
144     This is mainly a bug-fixing release, with a small number of developments:
145    
146     . The JIT compiler now supports partial matching and the (*MARK) and
147     (*COMMIT) verbs.
148    
149 ph10 988 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
150 ph10 975 pattern.
151    
152     . There should be a performance improvement when using the heap instead of the
153     stack for recursion.
154    
155     . pcregrep can now be linked with libedit as an alternative to libreadline.
156    
157     . pcregrep now has a --file-list option where the list of files to scan is
158     given as a file.
159    
160     . pcregrep now recognizes binary files and there are related options.
161    
162     . The Unicode tables have been updated to 6.1.0.
163    
164     As always, the full list of changes is in the ChangeLog file.
165    
166    
167 ph10 909 Release 8.30 04-February-2012
168     -----------------------------
169 ph10 840
170 ph10 842 Release 8.30 introduces a major new feature: support for 16-bit character
171 ph10 903 strings, compiled as a separate library. There are a few changes to the
172 ph10 857 8-bit library, in addition to some bug fixes.
173 ph10 840
174 ph10 857 . The pcre_info() function, which has been obsolete for over 10 years, has
175     been removed.
176 ph10 840
177 ph10 857 . When a compiled pattern was saved to a file and later reloaded on a host
178 ph10 903 with different endianness, PCRE used automatically to swap the bytes in some
179 ph10 857 of the data fields. With the advent of the 16-bit library, where more of this
180     swapping is needed, it is no longer done automatically. Instead, the bad
181     endianness is detected and a specific error is given. The user can then call
182     a new function called pcre_pattern_to_host_byte_order() (or an equivalent
183     16-bit function) to do the swap.
184 ph10 903
185 ph10 857 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
186     code points and are now faulted. (They are the so-called "surrogates"
187     that are reserved for coding high values in UTF-16.)
188    
189    
190 ph10 836 Release 8.21 12-Dec-2011
191     ------------------------
192    
193     This is almost entirely a bug-fix release. The only new feature is the ability
194     to obtain the size of the memory used by the JIT compiler.
195    
196    
197 ph10 738 Release 8.20 21-Oct-2011
198     ------------------------
199 ph10 672
200 ph10 691 The main change in this release is the inclusion of Zoltan Herczeg's
201 ph10 672 just-in-time compiler support, which can be accessed by building PCRE with
202     --enable-jit. Large performance benefits can be had in many situations. 8.20
203     also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
204 ph10 738 a number of infelicities and differences from Perl.
205 ph10 672
206    
207 ph10 659 Release 8.13 16-Aug-2011
208 ph10 654 ------------------------
209    
210     This is mainly a bug-fix release. There has been a lot of internal refactoring.
211     The Unicode tables have been updated. The only new feature in the library is
212     the passing of *MARK information to callouts. Some additions have been made to
213     pcretest to make testing easier and more comprehensive. There is a new option
214     for pcregrep to adjust its internal buffer size.
215    
216    
217 ph10 588 Release 8.12 15-Jan-2011
218     ------------------------
219    
220 ph10 589 This release fixes some bugs in pcregrep, one of which caused the tests to fail
221 ph10 588 on 64-bit big-endian systems. There are no changes to the code of the library.
222    
223    
224 ph10 581 Release 8.11 10-Dec-2010
225 ph10 579 ------------------------
226    
227     A number of bugs in the library and in pcregrep have been fixed. As always, see
228     ChangeLog for details. The following are the non-bug-fix changes:
229    
230     . Added --match-limit and --recursion-limit to pcregrep.
231    
232     . Added an optional parentheses number to the -o and --only-matching options
233     of pcregrep.
234    
235     . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
236     \B.
237    
238     . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
239     bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
240    
241     . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
242     START_OPTIMIZE option, which is now allowed at compile time
243    
244    
245 ph10 548 Release 8.10 25-Jun-2010
246 ph10 535 ------------------------
247    
248 ph10 545 There are two major additions: support for (*MARK) and friends, and the option
249 ph10 535 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
250     opposites) so that they make use of Unicode properties. There are also a number
251     of lesser new features, and several bugs have been fixed. A new option,
252     --line-buffered, has been added to pcregrep, for use when it is connected to
253     pipes.
254    
255    
256 ph10 508 Release 8.02 19-Mar-2010
257 ph10 507 ------------------------
258    
259     Another bug-fix release.
260    
261    
262 ph10 489 Release 8.01 19-Jan-2010
263     ------------------------
264    
265     This is a bug-fix release. Several bugs in the code itself and some bugs and
266     infelicities in the build system have been fixed.
267    
268    
269 ph10 469 Release 8.00 19-Oct-09
270 ph10 461 ----------------------
271    
272     Bugs have been fixed in the library and in pcregrep. There are also some
273     enhancements. Restrictions on patterns used for partial matching have been
274     removed, extra information is given for partial matches, the partial matching
275     process has been improved, and an option to make a partial match override a
276     full match is available. The "study" process has been enhanced by finding a
277     lower bound matching length. Groups with duplicate numbers may now have
278     duplicated names without the use of PCRE_DUPNAMES. However, they may not have
279     different names. The documentation has been revised to reflect these changes.
280     The version number has been expanded to 3 digits as it is clear that the rate
281     of change is not slowing down.
282    
283    
284 ph10 415 Release 7.9 11-Apr-09
285 ph10 411 ---------------------
286 ph10 345
287 ph10 411 Mostly bugfixes and tidies with just a couple of minor functional additions.
288    
289    
290 ph10 374 Release 7.8 05-Sep-08
291 ph10 371 ---------------------
292    
293     More bug fixes, plus a performance improvement in Unicode character property
294     lookup.
295    
296    
297 ph10 347 Release 7.7 07-May-08
298 ph10 345 ---------------------
299    
300     This is once again mainly a bug-fix release, but there are a couple of new
301     features.
302    
303    
304 ph10 319 Release 7.6 28-Jan-08
305 ph10 309 ---------------------
306    
307     The main reason for having this release so soon after 7.5 is because it fixes a
308     potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
309     addition, the CMake configuration files have been brought up to date.
310    
311    
312 ph10 298 Release 7.5 10-Jan-08
313 ph10 289 ---------------------
314 ph10 122
315 ph10 289 This is mainly a bug-fix release. However the ability to link pcregrep with
316     libz or libbz2 and the ability to link pcretest with libreadline have been
317     added. Also the --line-offsets and --file-offsets options were added to
318     pcregrep.
319    
320    
321 ph10 260 Release 7.4 21-Sep-07
322 ph10 242 ---------------------
323    
324 ph10 243 The only change of specification is the addition of options to control whether
325 ph10 242 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
326 ph10 243 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
327 ph10 261 relocations needed in a shared library. There have also been some documentation
328     updates, in particular, some more information about using CMake to build PCRE
329     has been added to the NON-UNIX-USE file.
330 ph10 242
331    
332 ph10 228 Release 7.3 28-Aug-07
333 ph10 212 ---------------------
334    
335     Most changes are bug fixes. Some that are not:
336    
337     1. There is some support for Perl 5.10's experimental "backtracking control
338     verbs" such as (*PRUNE).
339    
340     2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
341     restrictive in the strings it accepts.
342    
343     3. Checking for potential integer overflow has been made more dynamic, and as a
344     consequence there is no longer a hard limit on the size of a subpattern that
345     has a limited repeat count.
346 ph10 227
347     4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
348     no longer advance by two characters instead of one when an unanchored match
349     fails at CRLF if there are explicit CR or LF matches within the pattern.
350 ph10 226 This gets rid of some anomalous effects that previously occurred.
351 ph10 212
352 ph10 227 5. Some PCRE-specific settings for varying the newline options at the start of
353     a pattern have been added.
354 ph10 212
355 ph10 227
356 ph10 184 Release 7.2 19-Jun-07
357 ph10 157 ---------------------
358    
359 ph10 172 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
360 ph10 181 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
361     and \V).
362 ph10 168
363 ph10 159 Correction to the notes for 7.1: the note about shared libraries for Windows is
364     wrong. Previously, three libraries were built, but each could function
365     independently. For example, the pcreposix library also included all the
366     functions from the basic pcre library. The change is that the three libraries
367     are no longer independent. They are like the Unix libraries. To use the
368     pcreposix functions, for example, you need to link with both the pcreposix and
369 ph10 157 the basic pcre library.
370    
371 ph10 166 Some more features from Perl 5.10 have been added:
372 ph10 157
373 ph10 166 (?-n) and (?+n) relative references for recursion and subroutines.
374 ph10 172
375     (?(-n) and (?(+n) relative references as conditions.
376 ph10 182
377 ph10 181 \k{name} and \g{name} are synonyms for \k<name>.
378 ph10 172
379 ph10 168 \K to reset the start of the matched string; for example, (foo)\Kbar
380 ph10 175 matches bar preceded by foo, but only sets bar as the matched string.
381 ph10 182
382     (?| introduces a group where the capturing parentheses in each alternative
383     start from the same number; for example, (?|(abc)|(xyz)) sets capturing
384 ph10 175 parentheses number 1 in both cases.
385 ph10 166
386 ph10 182 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
387 ph10 166
388 ph10 182
389 ph10 155 Release 7.1 24-Apr-07
390 nigel 93 ---------------------
391    
392 ph10 155 There is only one new feature in this release: a linebreak setting of
393     PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
394     recognizes only CRLF, CR, and LF as linebreaks.
395 ph10 122
396 ph10 155 A few bugs are fixed (see ChangeLog for details), but the major change is a
397     complete re-implementation of the build system. This now has full Autotools
398     support and so is now "standard" in some sense. It should help with compiling
399     PCRE in a wide variety of environments.
400    
401 ph10 146 NOTE: when building shared libraries for Windows, three dlls are now built,
402     called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
403     included in a single dll.
404    
405     Another important change is that the dftables auxiliary program is no longer
406 ph10 128 compiled and run at "make" time by default. Instead, a default set of character
407     tables (assuming ASCII coding) is used. If you want to use dftables to generate
408     the character tables as previously, add --enable-rebuild-chartables to the
409     "configure" command. You must do this if you are compiling PCRE to run on a
410     system that uses EBCDIC code.
411 ph10 122
412 ph10 128 There is a discussion about character tables in the README file. The default is
413     not to use dftables so that that there is no problem when cross-compiling.
414    
415    
416 ph10 122 Release 7.0 19-Dec-06
417     ---------------------
418    
419 nigel 93 This release has a new major number because there have been some internal
420     upheavals to facilitate the addition of new optimizations and other facilities,
421     and to make subsequent maintenance and extension easier. Compilation is likely
422     to be a bit slower, but there should be no major effect on runtime performance.
423     Previously compiled patterns are NOT upwards compatible with this release. If
424     you have saved compiled patterns from a previous release, you will have to
425     re-compile them. Important changes that are visible to users are:
426    
427     1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
428     some more scripts.
429    
430     2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
431     sequence as a newline.
432    
433     3. The \R escape matches a single Unicode newline sequence as a single unit.
434    
435     4. New features that will appear in Perl 5.10 are now in PCRE. These include
436     alternative Perl syntax for named parentheses, and Perl syntax for
437     recursion.
438    
439     5. The C++ wrapper interface has been extended by the addition of a
440     QuoteMeta function and the ability to allow copy construction and
441     assignment.
442    
443     For a complete list of changes, see the ChangeLog file.
444    
445    
446 nigel 91 Release 6.7 04-Jul-06
447     ---------------------
448    
449     The main additions to this release are the ability to use the same name for
450     multiple sets of parentheses, and support for CRLF line endings in both the
451     library and pcregrep (and in pcretest for testing).
452    
453     Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
454     significantly reduced for certain subject strings.
455    
456    
457 nigel 87 Release 6.5 01-Feb-06
458     ---------------------
459    
460     Important changes in this release:
461    
462     1. A number of new features have been added to pcregrep.
463    
464     2. The Unicode property tables have been updated to Unicode 4.1.0, and the
465     supported properties have been extended with script names such as "Arabic",
466     and the derived properties "Any" and "L&". This has necessitated a change to
467     the interal format of compiled patterns. Any saved compiled patterns that
468     use \p or \P must be recompiled.
469    
470     3. The specification of recursion in patterns has been changed so that all
471     recursive subpatterns are automatically treated as atomic groups. Thus, for
472     example, (?R) is treated as if it were (?>(?R)). This is necessary because
473     otherwise there are situations where recursion does not work.
474    
475     See the ChangeLog for a complete list of changes, which include a number of bug
476     fixes and tidies.
477    
478    
479 nigel 77 Release 6.0 07-Jun-05
480     ---------------------
481    
482     The release number has been increased to 6.0 because of the addition of several
483     major new pieces of functionality.
484    
485     A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
486     algorithm, has been added. This has a number of advantages for certain cases,
487     though it does run more slowly, and lacks the ability to capture substrings. On
488     the other hand, it does find all matches, not just the first, and it works
489     better for partial matching. The pcrematching man page discusses the
490     differences.
491    
492     The pcretest program has been enhanced so that it can make use of the new
493     pcre_dfa_exec() matching function and the extra features it provides.
494    
495     The distribution now includes a C++ wrapper library. This is built
496     automatically if a C++ compiler is found. The pcrecpp man page discusses this
497     interface.
498    
499     The code itself has been re-organized into many more files, one for each
500     function, so it no longer requires everything to be linked in when static
501     linkage is used. As a consequence, some internal functions have had to have
502     their names exposed. These functions all have names starting with _pcre_. They
503     are undocumented, and are not intended for use by outside callers.
504    
505     The pcregrep program has been enhanced with new functionality such as
506     multiline-matching and options for output more matching context. See the
507     ChangeLog for a complete list of changes to the library and the utility
508     programs.
509    
510    
511 nigel 75 Release 5.0 13-Sep-04
512     ---------------------
513    
514     The licence under which PCRE is released has been changed to the more
515     conventional "BSD" licence.
516    
517     In the code, some bugs have been fixed, and there are also some major changes
518     in this release (which is why I've increased the number to 5.0). Some changes
519     are internal rearrangements, and some provide a number of new facilities. The
520     new features are:
521    
522     1. There's an "automatic callout" feature that inserts callouts before every
523     item in the regex, and there's a new callout field that gives the position
524     in the pattern - useful for debugging and tracing.
525    
526     2. The extra_data structure can now be used to pass in a set of character
527     tables at exec time. This is useful if compiled regex are saved and re-used
528     at a later time when the tables may not be at the same address. If the
529     default internal tables are used, the pointer saved with the compiled
530     pattern is now set to NULL, which means that you don't need to do anything
531     special unless you are using custom tables.
532    
533     3. It is possible, with some restrictions on the content of the regex, to
534     request "partial" matching. A special return code is given if all of the
535     subject string matched part of the regex. This could be useful for testing
536     an input field as it is being typed.
537    
538     4. There is now some optional support for Unicode character properties, which
539     means that the patterns items such as \p{Lu} and \X can now be used. Only
540     the general category properties are supported. If PCRE is compiled with this
541     support, an additional 90K data structure is include, which increases the
542     size of the library dramatically.
543    
544     5. There is support for saving compiled patterns and re-using them later.
545    
546     6. There is support for running regular expressions that were compiled on a
547     different host with the opposite endianness.
548    
549     7. The pcretest program has been extended to accommodate the new features.
550    
551     The main internal rearrangement is that sequences of literal characters are no
552     longer handled as strings. Instead, each character is handled on its own. This
553     makes some UTF-8 handling easier, and makes the support of partial matching
554     possible. Compiled patterns containing long literal strings will be larger as a
555     result of this change; I hope that performance will not be much affected.
556    
557    
558 nigel 73 Release 4.5 01-Dec-03
559     ---------------------
560    
561     Again mainly a bug-fix and tidying release, with only a couple of new features:
562    
563     1. It's possible now to compile PCRE so that it does not use recursive
564     function calls when matching. Instead it gets memory from the heap. This slows
565     things down, but may be necessary on systems with limited stacks.
566    
567     2. UTF-8 string checking has been tightened to reject overlong sequences and to
568     check that a starting offset points to the start of a character. Failure of the
569     latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
570    
571     3. PCRE can now be compiled for systems that use EBCDIC code.
572    
573    
574 nigel 71 Release 4.4 21-Aug-03
575     ---------------------
576    
577     This is mainly a bug-fix and tidying release. The only new feature is that PCRE
578     checks UTF-8 strings for validity by default. There is an option to suppress
579     this, just in case anybody wants that teeny extra bit of performance.
580    
581    
582     Releases 4.1 - 4.3
583     ------------------
584    
585     Sorry, I forgot about updating the NEWS file for these releases. Please take a
586     look at ChangeLog.
587    
588    
589 nigel 63 Release 4.0 17-Feb-03
590     ---------------------
591    
592     There have been a lot of changes for the 4.0 release, adding additional
593     functionality and mending bugs. Below is a list of the highlights of the new
594     functionality. For full details of these features, please consult the
595     documentation. For a complete list of changes, see the ChangeLog file.
596    
597     1. Support for Perl's \Q...\E escapes.
598    
599     2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
600     package. They provide some syntactic sugar for simple cases of "atomic
601     grouping".
602    
603     3. Support for the \G assertion. It is true when the current matching position
604     is at the start point of the match.
605    
606     4. A new feature that provides some of the functionality that Perl provides
607     with (?{...}). The facility is termed a "callout". The way it is done in PCRE
608     is for the caller to provide an optional function, by setting pcre_callout to
609     its entry point. To get the function called, the regex must include (?C) at
610     appropriate points.
611    
612     5. Support for recursive calls to individual subpatterns. This makes it really
613     easy to get totally confused.
614    
615     6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
616     name a group.
617    
618     7. Several extensions to UTF-8 support; it is now fairly complete. There is an
619     option for pcregrep to make it operate in UTF-8 mode.
620    
621     8. The single man page has been split into a number of separate man pages.
622     These also give rise to individual HTML pages which are put in a separate
623     directory. There is an index.html page that lists them all. Some hyperlinking
624     between the pages has been installed.
625    
626    
627 nigel 53 Release 3.5 15-Aug-01
628     ---------------------
629    
630     1. The configuring system has been upgraded to use later versions of autoconf
631     and libtool. By default it builds both a shared and a static library if the OS
632     supports it. You can use --disable-shared or --disable-static on the configure
633     command if you want only one of them.
634    
635     2. The pcretest utility is now installed along with pcregrep because it is
636     useful for users (to test regexs) and by doing this, it automatically gets
637     relinked by libtool. The documentation has been turned into a man page, so
638     there are now .1, .txt, and .html versions in /doc.
639    
640     3. Upgrades to pcregrep:
641     (i) Added long-form option names like gnu grep.
642     (ii) Added --help to list all options with an explanatory phrase.
643     (iii) Added -r, --recursive to recurse into sub-directories.
644     (iv) Added -f, --file to read patterns from a file.
645    
646     4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
647     script, to force use of CR or LF instead of \n in the source. On non-Unix
648     systems, the value can be set in config.h.
649    
650     5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
651     absolute limit. Changed the text of the error message to make this clear, and
652     likewise updated the man page.
653    
654     6. The limit of 99 on the number of capturing subpatterns has been removed.
655     The new limit is 65535, which I hope will not be a "real" limit.
656    
657    
658 nigel 49 Release 3.3 01-Aug-00
659     ---------------------
660    
661     There is some support for UTF-8 character strings. This is incomplete and
662     experimental. The documentation describes what is and what is not implemented.
663     Otherwise, this is just a bug-fixing release.
664    
665    
666 nigel 43 Release 3.0 01-Feb-00
667     ---------------------
668 nigel 41
669 nigel 43 1. A "configure" script is now used to configure PCRE for Unix systems. It
670     builds a Makefile, a config.h file, and the pcre-config script.
671    
672     2. PCRE is built as a shared library by default.
673    
674     3. There is support for POSIX classes such as [:alpha:].
675    
676     5. There is an experimental recursion feature.
677    
678 nigel 41 ----------------------------------------------------------------------------
679     IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
680    
681     Please note that there has been a change in the API such that a larger
682     ovector is required at matching time, to provide some additional workspace.
683     The new man page has details. This change was necessary in order to support
684     some of the new functionality in Perl 5.005.
685    
686     IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
687    
688     Another (I hope this is the last!) change has been made to the API for the
689     pcre_compile() function. An additional argument has been added to make it
690     possible to pass over a pointer to character tables built in the current
691 ph10 1325 locale by pcre_maketables(). To use the default tables, this new argument
692 nigel 41 should be passed as NULL.
693    
694     IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
695    
696     Yet another (and again I hope this really is the last) change has been made
697     to the API for the pcre_exec() function. An additional argument has been
698     added to make it possible to start the match other than at the start of the
699     subject string. This is important if there are lookbehinds. The new man
700     page has the details, but you just want to convert existing programs, all
701     you need to do is to stick in a new fifth argument to pcre_exec(), with a
702     value of zero. For example, change
703    
704     pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
705     to
706     pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
707    
708     ****

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