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Revision 588 - (show annotations)
Sat Jan 15 11:22:47 2011 UTC (4 years, 5 months ago) by ph10
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Another bugfix for pcregrep with -M and colour.
1 News about PCRE releases
2 ------------------------
3
4 Release 8.12 15-Jan-2011
5 ------------------------
6
7 This release fixes some bugs in pcregrep, one of which caused the tests to fail
8 on 64-bit big-endian systems. There are no changes to the code of the library.
9
10
11 Release 8.11 10-Dec-2010
12 ------------------------
13
14 A number of bugs in the library and in pcregrep have been fixed. As always, see
15 ChangeLog for details. The following are the non-bug-fix changes:
16
17 . Added --match-limit and --recursion-limit to pcregrep.
18
19 . Added an optional parentheses number to the -o and --only-matching options
20 of pcregrep.
21
22 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
23 \B.
24
25 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
26 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
27
28 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
29 START_OPTIMIZE option, which is now allowed at compile time
30
31
32 Release 8.10 25-Jun-2010
33 ------------------------
34
35 There are two major additions: support for (*MARK) and friends, and the option
36 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
37 opposites) so that they make use of Unicode properties. There are also a number
38 of lesser new features, and several bugs have been fixed. A new option,
39 --line-buffered, has been added to pcregrep, for use when it is connected to
40 pipes.
41
42
43 Release 8.02 19-Mar-2010
44 ------------------------
45
46 Another bug-fix release.
47
48
49 Release 8.01 19-Jan-2010
50 ------------------------
51
52 This is a bug-fix release. Several bugs in the code itself and some bugs and
53 infelicities in the build system have been fixed.
54
55
56 Release 8.00 19-Oct-09
57 ----------------------
58
59 Bugs have been fixed in the library and in pcregrep. There are also some
60 enhancements. Restrictions on patterns used for partial matching have been
61 removed, extra information is given for partial matches, the partial matching
62 process has been improved, and an option to make a partial match override a
63 full match is available. The "study" process has been enhanced by finding a
64 lower bound matching length. Groups with duplicate numbers may now have
65 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
66 different names. The documentation has been revised to reflect these changes.
67 The version number has been expanded to 3 digits as it is clear that the rate
68 of change is not slowing down.
69
70
71 Release 7.9 11-Apr-09
72 ---------------------
73
74 Mostly bugfixes and tidies with just a couple of minor functional additions.
75
76
77 Release 7.8 05-Sep-08
78 ---------------------
79
80 More bug fixes, plus a performance improvement in Unicode character property
81 lookup.
82
83
84 Release 7.7 07-May-08
85 ---------------------
86
87 This is once again mainly a bug-fix release, but there are a couple of new
88 features.
89
90
91 Release 7.6 28-Jan-08
92 ---------------------
93
94 The main reason for having this release so soon after 7.5 is because it fixes a
95 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
96 addition, the CMake configuration files have been brought up to date.
97
98
99 Release 7.5 10-Jan-08
100 ---------------------
101
102 This is mainly a bug-fix release. However the ability to link pcregrep with
103 libz or libbz2 and the ability to link pcretest with libreadline have been
104 added. Also the --line-offsets and --file-offsets options were added to
105 pcregrep.
106
107
108 Release 7.4 21-Sep-07
109 ---------------------
110
111 The only change of specification is the addition of options to control whether
112 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
113 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
114 relocations needed in a shared library. There have also been some documentation
115 updates, in particular, some more information about using CMake to build PCRE
116 has been added to the NON-UNIX-USE file.
117
118
119 Release 7.3 28-Aug-07
120 ---------------------
121
122 Most changes are bug fixes. Some that are not:
123
124 1. There is some support for Perl 5.10's experimental "backtracking control
125 verbs" such as (*PRUNE).
126
127 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
128 restrictive in the strings it accepts.
129
130 3. Checking for potential integer overflow has been made more dynamic, and as a
131 consequence there is no longer a hard limit on the size of a subpattern that
132 has a limited repeat count.
133
134 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
135 no longer advance by two characters instead of one when an unanchored match
136 fails at CRLF if there are explicit CR or LF matches within the pattern.
137 This gets rid of some anomalous effects that previously occurred.
138
139 5. Some PCRE-specific settings for varying the newline options at the start of
140 a pattern have been added.
141
142
143 Release 7.2 19-Jun-07
144 ---------------------
145
146 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
147 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
148 and \V).
149
150 Correction to the notes for 7.1: the note about shared libraries for Windows is
151 wrong. Previously, three libraries were built, but each could function
152 independently. For example, the pcreposix library also included all the
153 functions from the basic pcre library. The change is that the three libraries
154 are no longer independent. They are like the Unix libraries. To use the
155 pcreposix functions, for example, you need to link with both the pcreposix and
156 the basic pcre library.
157
158 Some more features from Perl 5.10 have been added:
159
160 (?-n) and (?+n) relative references for recursion and subroutines.
161
162 (?(-n) and (?(+n) relative references as conditions.
163
164 \k{name} and \g{name} are synonyms for \k<name>.
165
166 \K to reset the start of the matched string; for example, (foo)\Kbar
167 matches bar preceded by foo, but only sets bar as the matched string.
168
169 (?| introduces a group where the capturing parentheses in each alternative
170 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
171 parentheses number 1 in both cases.
172
173 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
174
175
176 Release 7.1 24-Apr-07
177 ---------------------
178
179 There is only one new feature in this release: a linebreak setting of
180 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
181 recognizes only CRLF, CR, and LF as linebreaks.
182
183 A few bugs are fixed (see ChangeLog for details), but the major change is a
184 complete re-implementation of the build system. This now has full Autotools
185 support and so is now "standard" in some sense. It should help with compiling
186 PCRE in a wide variety of environments.
187
188 NOTE: when building shared libraries for Windows, three dlls are now built,
189 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
190 included in a single dll.
191
192 Another important change is that the dftables auxiliary program is no longer
193 compiled and run at "make" time by default. Instead, a default set of character
194 tables (assuming ASCII coding) is used. If you want to use dftables to generate
195 the character tables as previously, add --enable-rebuild-chartables to the
196 "configure" command. You must do this if you are compiling PCRE to run on a
197 system that uses EBCDIC code.
198
199 There is a discussion about character tables in the README file. The default is
200 not to use dftables so that that there is no problem when cross-compiling.
201
202
203 Release 7.0 19-Dec-06
204 ---------------------
205
206 This release has a new major number because there have been some internal
207 upheavals to facilitate the addition of new optimizations and other facilities,
208 and to make subsequent maintenance and extension easier. Compilation is likely
209 to be a bit slower, but there should be no major effect on runtime performance.
210 Previously compiled patterns are NOT upwards compatible with this release. If
211 you have saved compiled patterns from a previous release, you will have to
212 re-compile them. Important changes that are visible to users are:
213
214 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
215 some more scripts.
216
217 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
218 sequence as a newline.
219
220 3. The \R escape matches a single Unicode newline sequence as a single unit.
221
222 4. New features that will appear in Perl 5.10 are now in PCRE. These include
223 alternative Perl syntax for named parentheses, and Perl syntax for
224 recursion.
225
226 5. The C++ wrapper interface has been extended by the addition of a
227 QuoteMeta function and the ability to allow copy construction and
228 assignment.
229
230 For a complete list of changes, see the ChangeLog file.
231
232
233 Release 6.7 04-Jul-06
234 ---------------------
235
236 The main additions to this release are the ability to use the same name for
237 multiple sets of parentheses, and support for CRLF line endings in both the
238 library and pcregrep (and in pcretest for testing).
239
240 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
241 significantly reduced for certain subject strings.
242
243
244 Release 6.5 01-Feb-06
245 ---------------------
246
247 Important changes in this release:
248
249 1. A number of new features have been added to pcregrep.
250
251 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
252 supported properties have been extended with script names such as "Arabic",
253 and the derived properties "Any" and "L&". This has necessitated a change to
254 the interal format of compiled patterns. Any saved compiled patterns that
255 use \p or \P must be recompiled.
256
257 3. The specification of recursion in patterns has been changed so that all
258 recursive subpatterns are automatically treated as atomic groups. Thus, for
259 example, (?R) is treated as if it were (?>(?R)). This is necessary because
260 otherwise there are situations where recursion does not work.
261
262 See the ChangeLog for a complete list of changes, which include a number of bug
263 fixes and tidies.
264
265
266 Release 6.0 07-Jun-05
267 ---------------------
268
269 The release number has been increased to 6.0 because of the addition of several
270 major new pieces of functionality.
271
272 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
273 algorithm, has been added. This has a number of advantages for certain cases,
274 though it does run more slowly, and lacks the ability to capture substrings. On
275 the other hand, it does find all matches, not just the first, and it works
276 better for partial matching. The pcrematching man page discusses the
277 differences.
278
279 The pcretest program has been enhanced so that it can make use of the new
280 pcre_dfa_exec() matching function and the extra features it provides.
281
282 The distribution now includes a C++ wrapper library. This is built
283 automatically if a C++ compiler is found. The pcrecpp man page discusses this
284 interface.
285
286 The code itself has been re-organized into many more files, one for each
287 function, so it no longer requires everything to be linked in when static
288 linkage is used. As a consequence, some internal functions have had to have
289 their names exposed. These functions all have names starting with _pcre_. They
290 are undocumented, and are not intended for use by outside callers.
291
292 The pcregrep program has been enhanced with new functionality such as
293 multiline-matching and options for output more matching context. See the
294 ChangeLog for a complete list of changes to the library and the utility
295 programs.
296
297
298 Release 5.0 13-Sep-04
299 ---------------------
300
301 The licence under which PCRE is released has been changed to the more
302 conventional "BSD" licence.
303
304 In the code, some bugs have been fixed, and there are also some major changes
305 in this release (which is why I've increased the number to 5.0). Some changes
306 are internal rearrangements, and some provide a number of new facilities. The
307 new features are:
308
309 1. There's an "automatic callout" feature that inserts callouts before every
310 item in the regex, and there's a new callout field that gives the position
311 in the pattern - useful for debugging and tracing.
312
313 2. The extra_data structure can now be used to pass in a set of character
314 tables at exec time. This is useful if compiled regex are saved and re-used
315 at a later time when the tables may not be at the same address. If the
316 default internal tables are used, the pointer saved with the compiled
317 pattern is now set to NULL, which means that you don't need to do anything
318 special unless you are using custom tables.
319
320 3. It is possible, with some restrictions on the content of the regex, to
321 request "partial" matching. A special return code is given if all of the
322 subject string matched part of the regex. This could be useful for testing
323 an input field as it is being typed.
324
325 4. There is now some optional support for Unicode character properties, which
326 means that the patterns items such as \p{Lu} and \X can now be used. Only
327 the general category properties are supported. If PCRE is compiled with this
328 support, an additional 90K data structure is include, which increases the
329 size of the library dramatically.
330
331 5. There is support for saving compiled patterns and re-using them later.
332
333 6. There is support for running regular expressions that were compiled on a
334 different host with the opposite endianness.
335
336 7. The pcretest program has been extended to accommodate the new features.
337
338 The main internal rearrangement is that sequences of literal characters are no
339 longer handled as strings. Instead, each character is handled on its own. This
340 makes some UTF-8 handling easier, and makes the support of partial matching
341 possible. Compiled patterns containing long literal strings will be larger as a
342 result of this change; I hope that performance will not be much affected.
343
344
345 Release 4.5 01-Dec-03
346 ---------------------
347
348 Again mainly a bug-fix and tidying release, with only a couple of new features:
349
350 1. It's possible now to compile PCRE so that it does not use recursive
351 function calls when matching. Instead it gets memory from the heap. This slows
352 things down, but may be necessary on systems with limited stacks.
353
354 2. UTF-8 string checking has been tightened to reject overlong sequences and to
355 check that a starting offset points to the start of a character. Failure of the
356 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
357
358 3. PCRE can now be compiled for systems that use EBCDIC code.
359
360
361 Release 4.4 21-Aug-03
362 ---------------------
363
364 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
365 checks UTF-8 strings for validity by default. There is an option to suppress
366 this, just in case anybody wants that teeny extra bit of performance.
367
368
369 Releases 4.1 - 4.3
370 ------------------
371
372 Sorry, I forgot about updating the NEWS file for these releases. Please take a
373 look at ChangeLog.
374
375
376 Release 4.0 17-Feb-03
377 ---------------------
378
379 There have been a lot of changes for the 4.0 release, adding additional
380 functionality and mending bugs. Below is a list of the highlights of the new
381 functionality. For full details of these features, please consult the
382 documentation. For a complete list of changes, see the ChangeLog file.
383
384 1. Support for Perl's \Q...\E escapes.
385
386 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
387 package. They provide some syntactic sugar for simple cases of "atomic
388 grouping".
389
390 3. Support for the \G assertion. It is true when the current matching position
391 is at the start point of the match.
392
393 4. A new feature that provides some of the functionality that Perl provides
394 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
395 is for the caller to provide an optional function, by setting pcre_callout to
396 its entry point. To get the function called, the regex must include (?C) at
397 appropriate points.
398
399 5. Support for recursive calls to individual subpatterns. This makes it really
400 easy to get totally confused.
401
402 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
403 name a group.
404
405 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
406 option for pcregrep to make it operate in UTF-8 mode.
407
408 8. The single man page has been split into a number of separate man pages.
409 These also give rise to individual HTML pages which are put in a separate
410 directory. There is an index.html page that lists them all. Some hyperlinking
411 between the pages has been installed.
412
413
414 Release 3.5 15-Aug-01
415 ---------------------
416
417 1. The configuring system has been upgraded to use later versions of autoconf
418 and libtool. By default it builds both a shared and a static library if the OS
419 supports it. You can use --disable-shared or --disable-static on the configure
420 command if you want only one of them.
421
422 2. The pcretest utility is now installed along with pcregrep because it is
423 useful for users (to test regexs) and by doing this, it automatically gets
424 relinked by libtool. The documentation has been turned into a man page, so
425 there are now .1, .txt, and .html versions in /doc.
426
427 3. Upgrades to pcregrep:
428 (i) Added long-form option names like gnu grep.
429 (ii) Added --help to list all options with an explanatory phrase.
430 (iii) Added -r, --recursive to recurse into sub-directories.
431 (iv) Added -f, --file to read patterns from a file.
432
433 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
434 script, to force use of CR or LF instead of \n in the source. On non-Unix
435 systems, the value can be set in config.h.
436
437 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
438 absolute limit. Changed the text of the error message to make this clear, and
439 likewise updated the man page.
440
441 6. The limit of 99 on the number of capturing subpatterns has been removed.
442 The new limit is 65535, which I hope will not be a "real" limit.
443
444
445 Release 3.3 01-Aug-00
446 ---------------------
447
448 There is some support for UTF-8 character strings. This is incomplete and
449 experimental. The documentation describes what is and what is not implemented.
450 Otherwise, this is just a bug-fixing release.
451
452
453 Release 3.0 01-Feb-00
454 ---------------------
455
456 1. A "configure" script is now used to configure PCRE for Unix systems. It
457 builds a Makefile, a config.h file, and the pcre-config script.
458
459 2. PCRE is built as a shared library by default.
460
461 3. There is support for POSIX classes such as [:alpha:].
462
463 5. There is an experimental recursion feature.
464
465 ----------------------------------------------------------------------------
466 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
467
468 Please note that there has been a change in the API such that a larger
469 ovector is required at matching time, to provide some additional workspace.
470 The new man page has details. This change was necessary in order to support
471 some of the new functionality in Perl 5.005.
472
473 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
474
475 Another (I hope this is the last!) change has been made to the API for the
476 pcre_compile() function. An additional argument has been added to make it
477 possible to pass over a pointer to character tables built in the current
478 locale by pcre_maketables(). To use the default tables, this new arguement
479 should be passed as NULL.
480
481 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
482
483 Yet another (and again I hope this really is the last) change has been made
484 to the API for the pcre_exec() function. An additional argument has been
485 added to make it possible to start the match other than at the start of the
486 subject string. This is important if there are lookbehinds. The new man
487 page has the details, but you just want to convert existing programs, all
488 you need to do is to stick in a new fifth argument to pcre_exec(), with a
489 value of zero. For example, change
490
491 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
492 to
493 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
494
495 ****

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