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Revision 840 - (show annotations) (download)
Fri Dec 30 19:32:50 2011 UTC (2 years, 7 months ago) by ph10
File size: 21087 byte(s)
16-bit update of non-man documentation files and the PrepareRelease script.

1 News about PCRE releases
2 ------------------------
3
4 Release 8.30
5 ------------
6
7 Release 8.30 introduces a major new feature: support for 16-bit character
8 strings, compiled as a separate library. There are no new features in the 8-bit
9 library, but some bugs have been mended. However, note that the pcre_info()
10 function, which has been obsolete for over 10 years, has been removed.
11
12
13 Release 8.21 12-Dec-2011
14 ------------------------
15
16 This is almost entirely a bug-fix release. The only new feature is the ability
17 to obtain the size of the memory used by the JIT compiler.
18
19
20 Release 8.20 21-Oct-2011
21 ------------------------
22
23 The main change in this release is the inclusion of Zoltan Herczeg's
24 just-in-time compiler support, which can be accessed by building PCRE with
25 --enable-jit. Large performance benefits can be had in many situations. 8.20
26 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
27 a number of infelicities and differences from Perl.
28
29
30 Release 8.13 16-Aug-2011
31 ------------------------
32
33 This is mainly a bug-fix release. There has been a lot of internal refactoring.
34 The Unicode tables have been updated. The only new feature in the library is
35 the passing of *MARK information to callouts. Some additions have been made to
36 pcretest to make testing easier and more comprehensive. There is a new option
37 for pcregrep to adjust its internal buffer size.
38
39
40 Release 8.12 15-Jan-2011
41 ------------------------
42
43 This release fixes some bugs in pcregrep, one of which caused the tests to fail
44 on 64-bit big-endian systems. There are no changes to the code of the library.
45
46
47 Release 8.11 10-Dec-2010
48 ------------------------
49
50 A number of bugs in the library and in pcregrep have been fixed. As always, see
51 ChangeLog for details. The following are the non-bug-fix changes:
52
53 . Added --match-limit and --recursion-limit to pcregrep.
54
55 . Added an optional parentheses number to the -o and --only-matching options
56 of pcregrep.
57
58 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
59 \B.
60
61 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
62 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
63
64 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
65 START_OPTIMIZE option, which is now allowed at compile time
66
67
68 Release 8.10 25-Jun-2010
69 ------------------------
70
71 There are two major additions: support for (*MARK) and friends, and the option
72 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
73 opposites) so that they make use of Unicode properties. There are also a number
74 of lesser new features, and several bugs have been fixed. A new option,
75 --line-buffered, has been added to pcregrep, for use when it is connected to
76 pipes.
77
78
79 Release 8.02 19-Mar-2010
80 ------------------------
81
82 Another bug-fix release.
83
84
85 Release 8.01 19-Jan-2010
86 ------------------------
87
88 This is a bug-fix release. Several bugs in the code itself and some bugs and
89 infelicities in the build system have been fixed.
90
91
92 Release 8.00 19-Oct-09
93 ----------------------
94
95 Bugs have been fixed in the library and in pcregrep. There are also some
96 enhancements. Restrictions on patterns used for partial matching have been
97 removed, extra information is given for partial matches, the partial matching
98 process has been improved, and an option to make a partial match override a
99 full match is available. The "study" process has been enhanced by finding a
100 lower bound matching length. Groups with duplicate numbers may now have
101 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
102 different names. The documentation has been revised to reflect these changes.
103 The version number has been expanded to 3 digits as it is clear that the rate
104 of change is not slowing down.
105
106
107 Release 7.9 11-Apr-09
108 ---------------------
109
110 Mostly bugfixes and tidies with just a couple of minor functional additions.
111
112
113 Release 7.8 05-Sep-08
114 ---------------------
115
116 More bug fixes, plus a performance improvement in Unicode character property
117 lookup.
118
119
120 Release 7.7 07-May-08
121 ---------------------
122
123 This is once again mainly a bug-fix release, but there are a couple of new
124 features.
125
126
127 Release 7.6 28-Jan-08
128 ---------------------
129
130 The main reason for having this release so soon after 7.5 is because it fixes a
131 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
132 addition, the CMake configuration files have been brought up to date.
133
134
135 Release 7.5 10-Jan-08
136 ---------------------
137
138 This is mainly a bug-fix release. However the ability to link pcregrep with
139 libz or libbz2 and the ability to link pcretest with libreadline have been
140 added. Also the --line-offsets and --file-offsets options were added to
141 pcregrep.
142
143
144 Release 7.4 21-Sep-07
145 ---------------------
146
147 The only change of specification is the addition of options to control whether
148 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
149 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
150 relocations needed in a shared library. There have also been some documentation
151 updates, in particular, some more information about using CMake to build PCRE
152 has been added to the NON-UNIX-USE file.
153
154
155 Release 7.3 28-Aug-07
156 ---------------------
157
158 Most changes are bug fixes. Some that are not:
159
160 1. There is some support for Perl 5.10's experimental "backtracking control
161 verbs" such as (*PRUNE).
162
163 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
164 restrictive in the strings it accepts.
165
166 3. Checking for potential integer overflow has been made more dynamic, and as a
167 consequence there is no longer a hard limit on the size of a subpattern that
168 has a limited repeat count.
169
170 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
171 no longer advance by two characters instead of one when an unanchored match
172 fails at CRLF if there are explicit CR or LF matches within the pattern.
173 This gets rid of some anomalous effects that previously occurred.
174
175 5. Some PCRE-specific settings for varying the newline options at the start of
176 a pattern have been added.
177
178
179 Release 7.2 19-Jun-07
180 ---------------------
181
182 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
183 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
184 and \V).
185
186 Correction to the notes for 7.1: the note about shared libraries for Windows is
187 wrong. Previously, three libraries were built, but each could function
188 independently. For example, the pcreposix library also included all the
189 functions from the basic pcre library. The change is that the three libraries
190 are no longer independent. They are like the Unix libraries. To use the
191 pcreposix functions, for example, you need to link with both the pcreposix and
192 the basic pcre library.
193
194 Some more features from Perl 5.10 have been added:
195
196 (?-n) and (?+n) relative references for recursion and subroutines.
197
198 (?(-n) and (?(+n) relative references as conditions.
199
200 \k{name} and \g{name} are synonyms for \k<name>.
201
202 \K to reset the start of the matched string; for example, (foo)\Kbar
203 matches bar preceded by foo, but only sets bar as the matched string.
204
205 (?| introduces a group where the capturing parentheses in each alternative
206 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
207 parentheses number 1 in both cases.
208
209 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
210
211
212 Release 7.1 24-Apr-07
213 ---------------------
214
215 There is only one new feature in this release: a linebreak setting of
216 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
217 recognizes only CRLF, CR, and LF as linebreaks.
218
219 A few bugs are fixed (see ChangeLog for details), but the major change is a
220 complete re-implementation of the build system. This now has full Autotools
221 support and so is now "standard" in some sense. It should help with compiling
222 PCRE in a wide variety of environments.
223
224 NOTE: when building shared libraries for Windows, three dlls are now built,
225 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
226 included in a single dll.
227
228 Another important change is that the dftables auxiliary program is no longer
229 compiled and run at "make" time by default. Instead, a default set of character
230 tables (assuming ASCII coding) is used. If you want to use dftables to generate
231 the character tables as previously, add --enable-rebuild-chartables to the
232 "configure" command. You must do this if you are compiling PCRE to run on a
233 system that uses EBCDIC code.
234
235 There is a discussion about character tables in the README file. The default is
236 not to use dftables so that that there is no problem when cross-compiling.
237
238
239 Release 7.0 19-Dec-06
240 ---------------------
241
242 This release has a new major number because there have been some internal
243 upheavals to facilitate the addition of new optimizations and other facilities,
244 and to make subsequent maintenance and extension easier. Compilation is likely
245 to be a bit slower, but there should be no major effect on runtime performance.
246 Previously compiled patterns are NOT upwards compatible with this release. If
247 you have saved compiled patterns from a previous release, you will have to
248 re-compile them. Important changes that are visible to users are:
249
250 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
251 some more scripts.
252
253 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
254 sequence as a newline.
255
256 3. The \R escape matches a single Unicode newline sequence as a single unit.
257
258 4. New features that will appear in Perl 5.10 are now in PCRE. These include
259 alternative Perl syntax for named parentheses, and Perl syntax for
260 recursion.
261
262 5. The C++ wrapper interface has been extended by the addition of a
263 QuoteMeta function and the ability to allow copy construction and
264 assignment.
265
266 For a complete list of changes, see the ChangeLog file.
267
268
269 Release 6.7 04-Jul-06
270 ---------------------
271
272 The main additions to this release are the ability to use the same name for
273 multiple sets of parentheses, and support for CRLF line endings in both the
274 library and pcregrep (and in pcretest for testing).
275
276 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
277 significantly reduced for certain subject strings.
278
279
280 Release 6.5 01-Feb-06
281 ---------------------
282
283 Important changes in this release:
284
285 1. A number of new features have been added to pcregrep.
286
287 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
288 supported properties have been extended with script names such as "Arabic",
289 and the derived properties "Any" and "L&". This has necessitated a change to
290 the interal format of compiled patterns. Any saved compiled patterns that
291 use \p or \P must be recompiled.
292
293 3. The specification of recursion in patterns has been changed so that all
294 recursive subpatterns are automatically treated as atomic groups. Thus, for
295 example, (?R) is treated as if it were (?>(?R)). This is necessary because
296 otherwise there are situations where recursion does not work.
297
298 See the ChangeLog for a complete list of changes, which include a number of bug
299 fixes and tidies.
300
301
302 Release 6.0 07-Jun-05
303 ---------------------
304
305 The release number has been increased to 6.0 because of the addition of several
306 major new pieces of functionality.
307
308 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
309 algorithm, has been added. This has a number of advantages for certain cases,
310 though it does run more slowly, and lacks the ability to capture substrings. On
311 the other hand, it does find all matches, not just the first, and it works
312 better for partial matching. The pcrematching man page discusses the
313 differences.
314
315 The pcretest program has been enhanced so that it can make use of the new
316 pcre_dfa_exec() matching function and the extra features it provides.
317
318 The distribution now includes a C++ wrapper library. This is built
319 automatically if a C++ compiler is found. The pcrecpp man page discusses this
320 interface.
321
322 The code itself has been re-organized into many more files, one for each
323 function, so it no longer requires everything to be linked in when static
324 linkage is used. As a consequence, some internal functions have had to have
325 their names exposed. These functions all have names starting with _pcre_. They
326 are undocumented, and are not intended for use by outside callers.
327
328 The pcregrep program has been enhanced with new functionality such as
329 multiline-matching and options for output more matching context. See the
330 ChangeLog for a complete list of changes to the library and the utility
331 programs.
332
333
334 Release 5.0 13-Sep-04
335 ---------------------
336
337 The licence under which PCRE is released has been changed to the more
338 conventional "BSD" licence.
339
340 In the code, some bugs have been fixed, and there are also some major changes
341 in this release (which is why I've increased the number to 5.0). Some changes
342 are internal rearrangements, and some provide a number of new facilities. The
343 new features are:
344
345 1. There's an "automatic callout" feature that inserts callouts before every
346 item in the regex, and there's a new callout field that gives the position
347 in the pattern - useful for debugging and tracing.
348
349 2. The extra_data structure can now be used to pass in a set of character
350 tables at exec time. This is useful if compiled regex are saved and re-used
351 at a later time when the tables may not be at the same address. If the
352 default internal tables are used, the pointer saved with the compiled
353 pattern is now set to NULL, which means that you don't need to do anything
354 special unless you are using custom tables.
355
356 3. It is possible, with some restrictions on the content of the regex, to
357 request "partial" matching. A special return code is given if all of the
358 subject string matched part of the regex. This could be useful for testing
359 an input field as it is being typed.
360
361 4. There is now some optional support for Unicode character properties, which
362 means that the patterns items such as \p{Lu} and \X can now be used. Only
363 the general category properties are supported. If PCRE is compiled with this
364 support, an additional 90K data structure is include, which increases the
365 size of the library dramatically.
366
367 5. There is support for saving compiled patterns and re-using them later.
368
369 6. There is support for running regular expressions that were compiled on a
370 different host with the opposite endianness.
371
372 7. The pcretest program has been extended to accommodate the new features.
373
374 The main internal rearrangement is that sequences of literal characters are no
375 longer handled as strings. Instead, each character is handled on its own. This
376 makes some UTF-8 handling easier, and makes the support of partial matching
377 possible. Compiled patterns containing long literal strings will be larger as a
378 result of this change; I hope that performance will not be much affected.
379
380
381 Release 4.5 01-Dec-03
382 ---------------------
383
384 Again mainly a bug-fix and tidying release, with only a couple of new features:
385
386 1. It's possible now to compile PCRE so that it does not use recursive
387 function calls when matching. Instead it gets memory from the heap. This slows
388 things down, but may be necessary on systems with limited stacks.
389
390 2. UTF-8 string checking has been tightened to reject overlong sequences and to
391 check that a starting offset points to the start of a character. Failure of the
392 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
393
394 3. PCRE can now be compiled for systems that use EBCDIC code.
395
396
397 Release 4.4 21-Aug-03
398 ---------------------
399
400 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
401 checks UTF-8 strings for validity by default. There is an option to suppress
402 this, just in case anybody wants that teeny extra bit of performance.
403
404
405 Releases 4.1 - 4.3
406 ------------------
407
408 Sorry, I forgot about updating the NEWS file for these releases. Please take a
409 look at ChangeLog.
410
411
412 Release 4.0 17-Feb-03
413 ---------------------
414
415 There have been a lot of changes for the 4.0 release, adding additional
416 functionality and mending bugs. Below is a list of the highlights of the new
417 functionality. For full details of these features, please consult the
418 documentation. For a complete list of changes, see the ChangeLog file.
419
420 1. Support for Perl's \Q...\E escapes.
421
422 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
423 package. They provide some syntactic sugar for simple cases of "atomic
424 grouping".
425
426 3. Support for the \G assertion. It is true when the current matching position
427 is at the start point of the match.
428
429 4. A new feature that provides some of the functionality that Perl provides
430 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
431 is for the caller to provide an optional function, by setting pcre_callout to
432 its entry point. To get the function called, the regex must include (?C) at
433 appropriate points.
434
435 5. Support for recursive calls to individual subpatterns. This makes it really
436 easy to get totally confused.
437
438 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
439 name a group.
440
441 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
442 option for pcregrep to make it operate in UTF-8 mode.
443
444 8. The single man page has been split into a number of separate man pages.
445 These also give rise to individual HTML pages which are put in a separate
446 directory. There is an index.html page that lists them all. Some hyperlinking
447 between the pages has been installed.
448
449
450 Release 3.5 15-Aug-01
451 ---------------------
452
453 1. The configuring system has been upgraded to use later versions of autoconf
454 and libtool. By default it builds both a shared and a static library if the OS
455 supports it. You can use --disable-shared or --disable-static on the configure
456 command if you want only one of them.
457
458 2. The pcretest utility is now installed along with pcregrep because it is
459 useful for users (to test regexs) and by doing this, it automatically gets
460 relinked by libtool. The documentation has been turned into a man page, so
461 there are now .1, .txt, and .html versions in /doc.
462
463 3. Upgrades to pcregrep:
464 (i) Added long-form option names like gnu grep.
465 (ii) Added --help to list all options with an explanatory phrase.
466 (iii) Added -r, --recursive to recurse into sub-directories.
467 (iv) Added -f, --file to read patterns from a file.
468
469 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
470 script, to force use of CR or LF instead of \n in the source. On non-Unix
471 systems, the value can be set in config.h.
472
473 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
474 absolute limit. Changed the text of the error message to make this clear, and
475 likewise updated the man page.
476
477 6. The limit of 99 on the number of capturing subpatterns has been removed.
478 The new limit is 65535, which I hope will not be a "real" limit.
479
480
481 Release 3.3 01-Aug-00
482 ---------------------
483
484 There is some support for UTF-8 character strings. This is incomplete and
485 experimental. The documentation describes what is and what is not implemented.
486 Otherwise, this is just a bug-fixing release.
487
488
489 Release 3.0 01-Feb-00
490 ---------------------
491
492 1. A "configure" script is now used to configure PCRE for Unix systems. It
493 builds a Makefile, a config.h file, and the pcre-config script.
494
495 2. PCRE is built as a shared library by default.
496
497 3. There is support for POSIX classes such as [:alpha:].
498
499 5. There is an experimental recursion feature.
500
501 ----------------------------------------------------------------------------
502 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
503
504 Please note that there has been a change in the API such that a larger
505 ovector is required at matching time, to provide some additional workspace.
506 The new man page has details. This change was necessary in order to support
507 some of the new functionality in Perl 5.005.
508
509 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
510
511 Another (I hope this is the last!) change has been made to the API for the
512 pcre_compile() function. An additional argument has been added to make it
513 possible to pass over a pointer to character tables built in the current
514 locale by pcre_maketables(). To use the default tables, this new arguement
515 should be passed as NULL.
516
517 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
518
519 Yet another (and again I hope this really is the last) change has been made
520 to the API for the pcre_exec() function. An additional argument has been
521 added to make it possible to start the match other than at the start of the
522 subject string. This is important if there are lookbehinds. The new man
523 page has the details, but you just want to convert existing programs, all
524 you need to do is to stick in a new fifth argument to pcre_exec(), with a
525 value of zero. For example, change
526
527 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
528 to
529 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
530
531 ****

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