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Revision 784 - (show annotations) (download)
Mon Dec 5 12:33:44 2011 UTC (2 years, 7 months ago) by ph10
File size: 20734 byte(s)
Tidies for 8.21-RC1 release.

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

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