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Revision 1470 - (hide annotations) (download)
Fri Apr 4 13:41:58 2014 UTC (2 weeks, 4 days ago) by ph10
File size: 27924 byte(s)
Final tidies for 8.35 release.

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

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