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Tue Aug 2 11:00:40 2011 UTC (3 years, 10 months ago) by ph10
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Documentation and general text tidies in preparation for test release.
1 News about PCRE releases
2 ------------------------
3
4 Release 8.13 02-Aug-2011
5 ------------------------
6
7 This is mainly a bug-fix release. There has been a lot of internal refactoring.
8 The Unicode tables have been updated. The only new feature in the library is
9 the passing of *MARK information to callouts. Some additions have been made to
10 pcretest to make testing easier and more comprehensive. There is a new option
11 for pcregrep to adjust its internal buffer size.
12
13
14 Release 8.12 15-Jan-2011
15 ------------------------
16
17 This release fixes some bugs in pcregrep, one of which caused the tests to fail
18 on 64-bit big-endian systems. There are no changes to the code of the library.
19
20
21 Release 8.11 10-Dec-2010
22 ------------------------
23
24 A number of bugs in the library and in pcregrep have been fixed. As always, see
25 ChangeLog for details. The following are the non-bug-fix changes:
26
27 . Added --match-limit and --recursion-limit to pcregrep.
28
29 . Added an optional parentheses number to the -o and --only-matching options
30 of pcregrep.
31
32 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
33 \B.
34
35 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
36 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
37
38 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
39 START_OPTIMIZE option, which is now allowed at compile time
40
41
42 Release 8.10 25-Jun-2010
43 ------------------------
44
45 There are two major additions: support for (*MARK) and friends, and the option
46 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
47 opposites) so that they make use of Unicode properties. There are also a number
48 of lesser new features, and several bugs have been fixed. A new option,
49 --line-buffered, has been added to pcregrep, for use when it is connected to
50 pipes.
51
52
53 Release 8.02 19-Mar-2010
54 ------------------------
55
56 Another bug-fix release.
57
58
59 Release 8.01 19-Jan-2010
60 ------------------------
61
62 This is a bug-fix release. Several bugs in the code itself and some bugs and
63 infelicities in the build system have been fixed.
64
65
66 Release 8.00 19-Oct-09
67 ----------------------
68
69 Bugs have been fixed in the library and in pcregrep. There are also some
70 enhancements. Restrictions on patterns used for partial matching have been
71 removed, extra information is given for partial matches, the partial matching
72 process has been improved, and an option to make a partial match override a
73 full match is available. The "study" process has been enhanced by finding a
74 lower bound matching length. Groups with duplicate numbers may now have
75 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
76 different names. The documentation has been revised to reflect these changes.
77 The version number has been expanded to 3 digits as it is clear that the rate
78 of change is not slowing down.
79
80
81 Release 7.9 11-Apr-09
82 ---------------------
83
84 Mostly bugfixes and tidies with just a couple of minor functional additions.
85
86
87 Release 7.8 05-Sep-08
88 ---------------------
89
90 More bug fixes, plus a performance improvement in Unicode character property
91 lookup.
92
93
94 Release 7.7 07-May-08
95 ---------------------
96
97 This is once again mainly a bug-fix release, but there are a couple of new
98 features.
99
100
101 Release 7.6 28-Jan-08
102 ---------------------
103
104 The main reason for having this release so soon after 7.5 is because it fixes a
105 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
106 addition, the CMake configuration files have been brought up to date.
107
108
109 Release 7.5 10-Jan-08
110 ---------------------
111
112 This is mainly a bug-fix release. However the ability to link pcregrep with
113 libz or libbz2 and the ability to link pcretest with libreadline have been
114 added. Also the --line-offsets and --file-offsets options were added to
115 pcregrep.
116
117
118 Release 7.4 21-Sep-07
119 ---------------------
120
121 The only change of specification is the addition of options to control whether
122 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
123 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
124 relocations needed in a shared library. There have also been some documentation
125 updates, in particular, some more information about using CMake to build PCRE
126 has been added to the NON-UNIX-USE file.
127
128
129 Release 7.3 28-Aug-07
130 ---------------------
131
132 Most changes are bug fixes. Some that are not:
133
134 1. There is some support for Perl 5.10's experimental "backtracking control
135 verbs" such as (*PRUNE).
136
137 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
138 restrictive in the strings it accepts.
139
140 3. Checking for potential integer overflow has been made more dynamic, and as a
141 consequence there is no longer a hard limit on the size of a subpattern that
142 has a limited repeat count.
143
144 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
145 no longer advance by two characters instead of one when an unanchored match
146 fails at CRLF if there are explicit CR or LF matches within the pattern.
147 This gets rid of some anomalous effects that previously occurred.
148
149 5. Some PCRE-specific settings for varying the newline options at the start of
150 a pattern have been added.
151
152
153 Release 7.2 19-Jun-07
154 ---------------------
155
156 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
157 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
158 and \V).
159
160 Correction to the notes for 7.1: the note about shared libraries for Windows is
161 wrong. Previously, three libraries were built, but each could function
162 independently. For example, the pcreposix library also included all the
163 functions from the basic pcre library. The change is that the three libraries
164 are no longer independent. They are like the Unix libraries. To use the
165 pcreposix functions, for example, you need to link with both the pcreposix and
166 the basic pcre library.
167
168 Some more features from Perl 5.10 have been added:
169
170 (?-n) and (?+n) relative references for recursion and subroutines.
171
172 (?(-n) and (?(+n) relative references as conditions.
173
174 \k{name} and \g{name} are synonyms for \k<name>.
175
176 \K to reset the start of the matched string; for example, (foo)\Kbar
177 matches bar preceded by foo, but only sets bar as the matched string.
178
179 (?| introduces a group where the capturing parentheses in each alternative
180 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
181 parentheses number 1 in both cases.
182
183 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
184
185
186 Release 7.1 24-Apr-07
187 ---------------------
188
189 There is only one new feature in this release: a linebreak setting of
190 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
191 recognizes only CRLF, CR, and LF as linebreaks.
192
193 A few bugs are fixed (see ChangeLog for details), but the major change is a
194 complete re-implementation of the build system. This now has full Autotools
195 support and so is now "standard" in some sense. It should help with compiling
196 PCRE in a wide variety of environments.
197
198 NOTE: when building shared libraries for Windows, three dlls are now built,
199 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
200 included in a single dll.
201
202 Another important change is that the dftables auxiliary program is no longer
203 compiled and run at "make" time by default. Instead, a default set of character
204 tables (assuming ASCII coding) is used. If you want to use dftables to generate
205 the character tables as previously, add --enable-rebuild-chartables to the
206 "configure" command. You must do this if you are compiling PCRE to run on a
207 system that uses EBCDIC code.
208
209 There is a discussion about character tables in the README file. The default is
210 not to use dftables so that that there is no problem when cross-compiling.
211
212
213 Release 7.0 19-Dec-06
214 ---------------------
215
216 This release has a new major number because there have been some internal
217 upheavals to facilitate the addition of new optimizations and other facilities,
218 and to make subsequent maintenance and extension easier. Compilation is likely
219 to be a bit slower, but there should be no major effect on runtime performance.
220 Previously compiled patterns are NOT upwards compatible with this release. If
221 you have saved compiled patterns from a previous release, you will have to
222 re-compile them. Important changes that are visible to users are:
223
224 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
225 some more scripts.
226
227 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
228 sequence as a newline.
229
230 3. The \R escape matches a single Unicode newline sequence as a single unit.
231
232 4. New features that will appear in Perl 5.10 are now in PCRE. These include
233 alternative Perl syntax for named parentheses, and Perl syntax for
234 recursion.
235
236 5. The C++ wrapper interface has been extended by the addition of a
237 QuoteMeta function and the ability to allow copy construction and
238 assignment.
239
240 For a complete list of changes, see the ChangeLog file.
241
242
243 Release 6.7 04-Jul-06
244 ---------------------
245
246 The main additions to this release are the ability to use the same name for
247 multiple sets of parentheses, and support for CRLF line endings in both the
248 library and pcregrep (and in pcretest for testing).
249
250 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
251 significantly reduced for certain subject strings.
252
253
254 Release 6.5 01-Feb-06
255 ---------------------
256
257 Important changes in this release:
258
259 1. A number of new features have been added to pcregrep.
260
261 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
262 supported properties have been extended with script names such as "Arabic",
263 and the derived properties "Any" and "L&". This has necessitated a change to
264 the interal format of compiled patterns. Any saved compiled patterns that
265 use \p or \P must be recompiled.
266
267 3. The specification of recursion in patterns has been changed so that all
268 recursive subpatterns are automatically treated as atomic groups. Thus, for
269 example, (?R) is treated as if it were (?>(?R)). This is necessary because
270 otherwise there are situations where recursion does not work.
271
272 See the ChangeLog for a complete list of changes, which include a number of bug
273 fixes and tidies.
274
275
276 Release 6.0 07-Jun-05
277 ---------------------
278
279 The release number has been increased to 6.0 because of the addition of several
280 major new pieces of functionality.
281
282 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
283 algorithm, has been added. This has a number of advantages for certain cases,
284 though it does run more slowly, and lacks the ability to capture substrings. On
285 the other hand, it does find all matches, not just the first, and it works
286 better for partial matching. The pcrematching man page discusses the
287 differences.
288
289 The pcretest program has been enhanced so that it can make use of the new
290 pcre_dfa_exec() matching function and the extra features it provides.
291
292 The distribution now includes a C++ wrapper library. This is built
293 automatically if a C++ compiler is found. The pcrecpp man page discusses this
294 interface.
295
296 The code itself has been re-organized into many more files, one for each
297 function, so it no longer requires everything to be linked in when static
298 linkage is used. As a consequence, some internal functions have had to have
299 their names exposed. These functions all have names starting with _pcre_. They
300 are undocumented, and are not intended for use by outside callers.
301
302 The pcregrep program has been enhanced with new functionality such as
303 multiline-matching and options for output more matching context. See the
304 ChangeLog for a complete list of changes to the library and the utility
305 programs.
306
307
308 Release 5.0 13-Sep-04
309 ---------------------
310
311 The licence under which PCRE is released has been changed to the more
312 conventional "BSD" licence.
313
314 In the code, some bugs have been fixed, and there are also some major changes
315 in this release (which is why I've increased the number to 5.0). Some changes
316 are internal rearrangements, and some provide a number of new facilities. The
317 new features are:
318
319 1. There's an "automatic callout" feature that inserts callouts before every
320 item in the regex, and there's a new callout field that gives the position
321 in the pattern - useful for debugging and tracing.
322
323 2. The extra_data structure can now be used to pass in a set of character
324 tables at exec time. This is useful if compiled regex are saved and re-used
325 at a later time when the tables may not be at the same address. If the
326 default internal tables are used, the pointer saved with the compiled
327 pattern is now set to NULL, which means that you don't need to do anything
328 special unless you are using custom tables.
329
330 3. It is possible, with some restrictions on the content of the regex, to
331 request "partial" matching. A special return code is given if all of the
332 subject string matched part of the regex. This could be useful for testing
333 an input field as it is being typed.
334
335 4. There is now some optional support for Unicode character properties, which
336 means that the patterns items such as \p{Lu} and \X can now be used. Only
337 the general category properties are supported. If PCRE is compiled with this
338 support, an additional 90K data structure is include, which increases the
339 size of the library dramatically.
340
341 5. There is support for saving compiled patterns and re-using them later.
342
343 6. There is support for running regular expressions that were compiled on a
344 different host with the opposite endianness.
345
346 7. The pcretest program has been extended to accommodate the new features.
347
348 The main internal rearrangement is that sequences of literal characters are no
349 longer handled as strings. Instead, each character is handled on its own. This
350 makes some UTF-8 handling easier, and makes the support of partial matching
351 possible. Compiled patterns containing long literal strings will be larger as a
352 result of this change; I hope that performance will not be much affected.
353
354
355 Release 4.5 01-Dec-03
356 ---------------------
357
358 Again mainly a bug-fix and tidying release, with only a couple of new features:
359
360 1. It's possible now to compile PCRE so that it does not use recursive
361 function calls when matching. Instead it gets memory from the heap. This slows
362 things down, but may be necessary on systems with limited stacks.
363
364 2. UTF-8 string checking has been tightened to reject overlong sequences and to
365 check that a starting offset points to the start of a character. Failure of the
366 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
367
368 3. PCRE can now be compiled for systems that use EBCDIC code.
369
370
371 Release 4.4 21-Aug-03
372 ---------------------
373
374 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
375 checks UTF-8 strings for validity by default. There is an option to suppress
376 this, just in case anybody wants that teeny extra bit of performance.
377
378
379 Releases 4.1 - 4.3
380 ------------------
381
382 Sorry, I forgot about updating the NEWS file for these releases. Please take a
383 look at ChangeLog.
384
385
386 Release 4.0 17-Feb-03
387 ---------------------
388
389 There have been a lot of changes for the 4.0 release, adding additional
390 functionality and mending bugs. Below is a list of the highlights of the new
391 functionality. For full details of these features, please consult the
392 documentation. For a complete list of changes, see the ChangeLog file.
393
394 1. Support for Perl's \Q...\E escapes.
395
396 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
397 package. They provide some syntactic sugar for simple cases of "atomic
398 grouping".
399
400 3. Support for the \G assertion. It is true when the current matching position
401 is at the start point of the match.
402
403 4. A new feature that provides some of the functionality that Perl provides
404 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
405 is for the caller to provide an optional function, by setting pcre_callout to
406 its entry point. To get the function called, the regex must include (?C) at
407 appropriate points.
408
409 5. Support for recursive calls to individual subpatterns. This makes it really
410 easy to get totally confused.
411
412 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
413 name a group.
414
415 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
416 option for pcregrep to make it operate in UTF-8 mode.
417
418 8. The single man page has been split into a number of separate man pages.
419 These also give rise to individual HTML pages which are put in a separate
420 directory. There is an index.html page that lists them all. Some hyperlinking
421 between the pages has been installed.
422
423
424 Release 3.5 15-Aug-01
425 ---------------------
426
427 1. The configuring system has been upgraded to use later versions of autoconf
428 and libtool. By default it builds both a shared and a static library if the OS
429 supports it. You can use --disable-shared or --disable-static on the configure
430 command if you want only one of them.
431
432 2. The pcretest utility is now installed along with pcregrep because it is
433 useful for users (to test regexs) and by doing this, it automatically gets
434 relinked by libtool. The documentation has been turned into a man page, so
435 there are now .1, .txt, and .html versions in /doc.
436
437 3. Upgrades to pcregrep:
438 (i) Added long-form option names like gnu grep.
439 (ii) Added --help to list all options with an explanatory phrase.
440 (iii) Added -r, --recursive to recurse into sub-directories.
441 (iv) Added -f, --file to read patterns from a file.
442
443 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
444 script, to force use of CR or LF instead of \n in the source. On non-Unix
445 systems, the value can be set in config.h.
446
447 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
448 absolute limit. Changed the text of the error message to make this clear, and
449 likewise updated the man page.
450
451 6. The limit of 99 on the number of capturing subpatterns has been removed.
452 The new limit is 65535, which I hope will not be a "real" limit.
453
454
455 Release 3.3 01-Aug-00
456 ---------------------
457
458 There is some support for UTF-8 character strings. This is incomplete and
459 experimental. The documentation describes what is and what is not implemented.
460 Otherwise, this is just a bug-fixing release.
461
462
463 Release 3.0 01-Feb-00
464 ---------------------
465
466 1. A "configure" script is now used to configure PCRE for Unix systems. It
467 builds a Makefile, a config.h file, and the pcre-config script.
468
469 2. PCRE is built as a shared library by default.
470
471 3. There is support for POSIX classes such as [:alpha:].
472
473 5. There is an experimental recursion feature.
474
475 ----------------------------------------------------------------------------
476 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
477
478 Please note that there has been a change in the API such that a larger
479 ovector is required at matching time, to provide some additional workspace.
480 The new man page has details. This change was necessary in order to support
481 some of the new functionality in Perl 5.005.
482
483 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
484
485 Another (I hope this is the last!) change has been made to the API for the
486 pcre_compile() function. An additional argument has been added to make it
487 possible to pass over a pointer to character tables built in the current
488 locale by pcre_maketables(). To use the default tables, this new arguement
489 should be passed as NULL.
490
491 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
492
493 Yet another (and again I hope this really is the last) change has been made
494 to the API for the pcre_exec() function. An additional argument has been
495 added to make it possible to start the match other than at the start of the
496 subject string. This is important if there are lookbehinds. The new man
497 page has the details, but you just want to convert existing programs, all
498 you need to do is to stick in a new fifth argument to pcre_exec(), with a
499 value of zero. For example, change
500
501 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
502 to
503 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
504
505 ****

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