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Revision 975 - (show annotations) (download)
Sat Jun 2 11:03:06 2012 UTC (2 years, 4 months ago) by ph10
File size: 22559 byte(s)
Document update for 8.31-RC1 test release.

1 News about PCRE releases
2 ------------------------
3
4 Release 8.31 02-June-2012
5 -------------------------
6
7 This is mainly a bug-fixing release, with a small number of developments:
8
9 . The JIT compiler now supports partial matching and the (*MARK) and
10 (*COMMIT) verbs.
11
12 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehing in a
13 pattern.
14
15 . There should be a performance improvement when using the heap instead of the
16 stack for recursion.
17
18 . pcregrep can now be linked with libedit as an alternative to libreadline.
19
20 . pcregrep now has a --file-list option where the list of files to scan is
21 given as a file.
22
23 . pcregrep now recognizes binary files and there are related options.
24
25 . The Unicode tables have been updated to 6.1.0.
26
27 As always, the full list of changes is in the ChangeLog file.
28
29
30 Release 8.30 04-February-2012
31 -----------------------------
32
33 Release 8.30 introduces a major new feature: support for 16-bit character
34 strings, compiled as a separate library. There are a few changes to the
35 8-bit library, in addition to some bug fixes.
36
37 . The pcre_info() function, which has been obsolete for over 10 years, has
38 been removed.
39
40 . When a compiled pattern was saved to a file and later reloaded on a host
41 with different endianness, PCRE used automatically to swap the bytes in some
42 of the data fields. With the advent of the 16-bit library, where more of this
43 swapping is needed, it is no longer done automatically. Instead, the bad
44 endianness is detected and a specific error is given. The user can then call
45 a new function called pcre_pattern_to_host_byte_order() (or an equivalent
46 16-bit function) to do the swap.
47
48 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
49 code points and are now faulted. (They are the so-called "surrogates"
50 that are reserved for coding high values in UTF-16.)
51
52
53 Release 8.21 12-Dec-2011
54 ------------------------
55
56 This is almost entirely a bug-fix release. The only new feature is the ability
57 to obtain the size of the memory used by the JIT compiler.
58
59
60 Release 8.20 21-Oct-2011
61 ------------------------
62
63 The main change in this release is the inclusion of Zoltan Herczeg's
64 just-in-time compiler support, which can be accessed by building PCRE with
65 --enable-jit. Large performance benefits can be had in many situations. 8.20
66 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
67 a number of infelicities and differences from Perl.
68
69
70 Release 8.13 16-Aug-2011
71 ------------------------
72
73 This is mainly a bug-fix release. There has been a lot of internal refactoring.
74 The Unicode tables have been updated. The only new feature in the library is
75 the passing of *MARK information to callouts. Some additions have been made to
76 pcretest to make testing easier and more comprehensive. There is a new option
77 for pcregrep to adjust its internal buffer size.
78
79
80 Release 8.12 15-Jan-2011
81 ------------------------
82
83 This release fixes some bugs in pcregrep, one of which caused the tests to fail
84 on 64-bit big-endian systems. There are no changes to the code of the library.
85
86
87 Release 8.11 10-Dec-2010
88 ------------------------
89
90 A number of bugs in the library and in pcregrep have been fixed. As always, see
91 ChangeLog for details. The following are the non-bug-fix changes:
92
93 . Added --match-limit and --recursion-limit to pcregrep.
94
95 . Added an optional parentheses number to the -o and --only-matching options
96 of pcregrep.
97
98 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
99 \B.
100
101 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
102 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
103
104 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
105 START_OPTIMIZE option, which is now allowed at compile time
106
107
108 Release 8.10 25-Jun-2010
109 ------------------------
110
111 There are two major additions: support for (*MARK) and friends, and the option
112 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
113 opposites) so that they make use of Unicode properties. There are also a number
114 of lesser new features, and several bugs have been fixed. A new option,
115 --line-buffered, has been added to pcregrep, for use when it is connected to
116 pipes.
117
118
119 Release 8.02 19-Mar-2010
120 ------------------------
121
122 Another bug-fix release.
123
124
125 Release 8.01 19-Jan-2010
126 ------------------------
127
128 This is a bug-fix release. Several bugs in the code itself and some bugs and
129 infelicities in the build system have been fixed.
130
131
132 Release 8.00 19-Oct-09
133 ----------------------
134
135 Bugs have been fixed in the library and in pcregrep. There are also some
136 enhancements. Restrictions on patterns used for partial matching have been
137 removed, extra information is given for partial matches, the partial matching
138 process has been improved, and an option to make a partial match override a
139 full match is available. The "study" process has been enhanced by finding a
140 lower bound matching length. Groups with duplicate numbers may now have
141 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
142 different names. The documentation has been revised to reflect these changes.
143 The version number has been expanded to 3 digits as it is clear that the rate
144 of change is not slowing down.
145
146
147 Release 7.9 11-Apr-09
148 ---------------------
149
150 Mostly bugfixes and tidies with just a couple of minor functional additions.
151
152
153 Release 7.8 05-Sep-08
154 ---------------------
155
156 More bug fixes, plus a performance improvement in Unicode character property
157 lookup.
158
159
160 Release 7.7 07-May-08
161 ---------------------
162
163 This is once again mainly a bug-fix release, but there are a couple of new
164 features.
165
166
167 Release 7.6 28-Jan-08
168 ---------------------
169
170 The main reason for having this release so soon after 7.5 is because it fixes a
171 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
172 addition, the CMake configuration files have been brought up to date.
173
174
175 Release 7.5 10-Jan-08
176 ---------------------
177
178 This is mainly a bug-fix release. However the ability to link pcregrep with
179 libz or libbz2 and the ability to link pcretest with libreadline have been
180 added. Also the --line-offsets and --file-offsets options were added to
181 pcregrep.
182
183
184 Release 7.4 21-Sep-07
185 ---------------------
186
187 The only change of specification is the addition of options to control whether
188 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
189 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
190 relocations needed in a shared library. There have also been some documentation
191 updates, in particular, some more information about using CMake to build PCRE
192 has been added to the NON-UNIX-USE file.
193
194
195 Release 7.3 28-Aug-07
196 ---------------------
197
198 Most changes are bug fixes. Some that are not:
199
200 1. There is some support for Perl 5.10's experimental "backtracking control
201 verbs" such as (*PRUNE).
202
203 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
204 restrictive in the strings it accepts.
205
206 3. Checking for potential integer overflow has been made more dynamic, and as a
207 consequence there is no longer a hard limit on the size of a subpattern that
208 has a limited repeat count.
209
210 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
211 no longer advance by two characters instead of one when an unanchored match
212 fails at CRLF if there are explicit CR or LF matches within the pattern.
213 This gets rid of some anomalous effects that previously occurred.
214
215 5. Some PCRE-specific settings for varying the newline options at the start of
216 a pattern have been added.
217
218
219 Release 7.2 19-Jun-07
220 ---------------------
221
222 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
223 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
224 and \V).
225
226 Correction to the notes for 7.1: the note about shared libraries for Windows is
227 wrong. Previously, three libraries were built, but each could function
228 independently. For example, the pcreposix library also included all the
229 functions from the basic pcre library. The change is that the three libraries
230 are no longer independent. They are like the Unix libraries. To use the
231 pcreposix functions, for example, you need to link with both the pcreposix and
232 the basic pcre library.
233
234 Some more features from Perl 5.10 have been added:
235
236 (?-n) and (?+n) relative references for recursion and subroutines.
237
238 (?(-n) and (?(+n) relative references as conditions.
239
240 \k{name} and \g{name} are synonyms for \k<name>.
241
242 \K to reset the start of the matched string; for example, (foo)\Kbar
243 matches bar preceded by foo, but only sets bar as the matched string.
244
245 (?| introduces a group where the capturing parentheses in each alternative
246 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
247 parentheses number 1 in both cases.
248
249 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
250
251
252 Release 7.1 24-Apr-07
253 ---------------------
254
255 There is only one new feature in this release: a linebreak setting of
256 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
257 recognizes only CRLF, CR, and LF as linebreaks.
258
259 A few bugs are fixed (see ChangeLog for details), but the major change is a
260 complete re-implementation of the build system. This now has full Autotools
261 support and so is now "standard" in some sense. It should help with compiling
262 PCRE in a wide variety of environments.
263
264 NOTE: when building shared libraries for Windows, three dlls are now built,
265 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
266 included in a single dll.
267
268 Another important change is that the dftables auxiliary program is no longer
269 compiled and run at "make" time by default. Instead, a default set of character
270 tables (assuming ASCII coding) is used. If you want to use dftables to generate
271 the character tables as previously, add --enable-rebuild-chartables to the
272 "configure" command. You must do this if you are compiling PCRE to run on a
273 system that uses EBCDIC code.
274
275 There is a discussion about character tables in the README file. The default is
276 not to use dftables so that that there is no problem when cross-compiling.
277
278
279 Release 7.0 19-Dec-06
280 ---------------------
281
282 This release has a new major number because there have been some internal
283 upheavals to facilitate the addition of new optimizations and other facilities,
284 and to make subsequent maintenance and extension easier. Compilation is likely
285 to be a bit slower, but there should be no major effect on runtime performance.
286 Previously compiled patterns are NOT upwards compatible with this release. If
287 you have saved compiled patterns from a previous release, you will have to
288 re-compile them. Important changes that are visible to users are:
289
290 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
291 some more scripts.
292
293 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
294 sequence as a newline.
295
296 3. The \R escape matches a single Unicode newline sequence as a single unit.
297
298 4. New features that will appear in Perl 5.10 are now in PCRE. These include
299 alternative Perl syntax for named parentheses, and Perl syntax for
300 recursion.
301
302 5. The C++ wrapper interface has been extended by the addition of a
303 QuoteMeta function and the ability to allow copy construction and
304 assignment.
305
306 For a complete list of changes, see the ChangeLog file.
307
308
309 Release 6.7 04-Jul-06
310 ---------------------
311
312 The main additions to this release are the ability to use the same name for
313 multiple sets of parentheses, and support for CRLF line endings in both the
314 library and pcregrep (and in pcretest for testing).
315
316 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
317 significantly reduced for certain subject strings.
318
319
320 Release 6.5 01-Feb-06
321 ---------------------
322
323 Important changes in this release:
324
325 1. A number of new features have been added to pcregrep.
326
327 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
328 supported properties have been extended with script names such as "Arabic",
329 and the derived properties "Any" and "L&". This has necessitated a change to
330 the interal format of compiled patterns. Any saved compiled patterns that
331 use \p or \P must be recompiled.
332
333 3. The specification of recursion in patterns has been changed so that all
334 recursive subpatterns are automatically treated as atomic groups. Thus, for
335 example, (?R) is treated as if it were (?>(?R)). This is necessary because
336 otherwise there are situations where recursion does not work.
337
338 See the ChangeLog for a complete list of changes, which include a number of bug
339 fixes and tidies.
340
341
342 Release 6.0 07-Jun-05
343 ---------------------
344
345 The release number has been increased to 6.0 because of the addition of several
346 major new pieces of functionality.
347
348 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
349 algorithm, has been added. This has a number of advantages for certain cases,
350 though it does run more slowly, and lacks the ability to capture substrings. On
351 the other hand, it does find all matches, not just the first, and it works
352 better for partial matching. The pcrematching man page discusses the
353 differences.
354
355 The pcretest program has been enhanced so that it can make use of the new
356 pcre_dfa_exec() matching function and the extra features it provides.
357
358 The distribution now includes a C++ wrapper library. This is built
359 automatically if a C++ compiler is found. The pcrecpp man page discusses this
360 interface.
361
362 The code itself has been re-organized into many more files, one for each
363 function, so it no longer requires everything to be linked in when static
364 linkage is used. As a consequence, some internal functions have had to have
365 their names exposed. These functions all have names starting with _pcre_. They
366 are undocumented, and are not intended for use by outside callers.
367
368 The pcregrep program has been enhanced with new functionality such as
369 multiline-matching and options for output more matching context. See the
370 ChangeLog for a complete list of changes to the library and the utility
371 programs.
372
373
374 Release 5.0 13-Sep-04
375 ---------------------
376
377 The licence under which PCRE is released has been changed to the more
378 conventional "BSD" licence.
379
380 In the code, some bugs have been fixed, and there are also some major changes
381 in this release (which is why I've increased the number to 5.0). Some changes
382 are internal rearrangements, and some provide a number of new facilities. The
383 new features are:
384
385 1. There's an "automatic callout" feature that inserts callouts before every
386 item in the regex, and there's a new callout field that gives the position
387 in the pattern - useful for debugging and tracing.
388
389 2. The extra_data structure can now be used to pass in a set of character
390 tables at exec time. This is useful if compiled regex are saved and re-used
391 at a later time when the tables may not be at the same address. If the
392 default internal tables are used, the pointer saved with the compiled
393 pattern is now set to NULL, which means that you don't need to do anything
394 special unless you are using custom tables.
395
396 3. It is possible, with some restrictions on the content of the regex, to
397 request "partial" matching. A special return code is given if all of the
398 subject string matched part of the regex. This could be useful for testing
399 an input field as it is being typed.
400
401 4. There is now some optional support for Unicode character properties, which
402 means that the patterns items such as \p{Lu} and \X can now be used. Only
403 the general category properties are supported. If PCRE is compiled with this
404 support, an additional 90K data structure is include, which increases the
405 size of the library dramatically.
406
407 5. There is support for saving compiled patterns and re-using them later.
408
409 6. There is support for running regular expressions that were compiled on a
410 different host with the opposite endianness.
411
412 7. The pcretest program has been extended to accommodate the new features.
413
414 The main internal rearrangement is that sequences of literal characters are no
415 longer handled as strings. Instead, each character is handled on its own. This
416 makes some UTF-8 handling easier, and makes the support of partial matching
417 possible. Compiled patterns containing long literal strings will be larger as a
418 result of this change; I hope that performance will not be much affected.
419
420
421 Release 4.5 01-Dec-03
422 ---------------------
423
424 Again mainly a bug-fix and tidying release, with only a couple of new features:
425
426 1. It's possible now to compile PCRE so that it does not use recursive
427 function calls when matching. Instead it gets memory from the heap. This slows
428 things down, but may be necessary on systems with limited stacks.
429
430 2. UTF-8 string checking has been tightened to reject overlong sequences and to
431 check that a starting offset points to the start of a character. Failure of the
432 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
433
434 3. PCRE can now be compiled for systems that use EBCDIC code.
435
436
437 Release 4.4 21-Aug-03
438 ---------------------
439
440 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
441 checks UTF-8 strings for validity by default. There is an option to suppress
442 this, just in case anybody wants that teeny extra bit of performance.
443
444
445 Releases 4.1 - 4.3
446 ------------------
447
448 Sorry, I forgot about updating the NEWS file for these releases. Please take a
449 look at ChangeLog.
450
451
452 Release 4.0 17-Feb-03
453 ---------------------
454
455 There have been a lot of changes for the 4.0 release, adding additional
456 functionality and mending bugs. Below is a list of the highlights of the new
457 functionality. For full details of these features, please consult the
458 documentation. For a complete list of changes, see the ChangeLog file.
459
460 1. Support for Perl's \Q...\E escapes.
461
462 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
463 package. They provide some syntactic sugar for simple cases of "atomic
464 grouping".
465
466 3. Support for the \G assertion. It is true when the current matching position
467 is at the start point of the match.
468
469 4. A new feature that provides some of the functionality that Perl provides
470 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
471 is for the caller to provide an optional function, by setting pcre_callout to
472 its entry point. To get the function called, the regex must include (?C) at
473 appropriate points.
474
475 5. Support for recursive calls to individual subpatterns. This makes it really
476 easy to get totally confused.
477
478 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
479 name a group.
480
481 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
482 option for pcregrep to make it operate in UTF-8 mode.
483
484 8. The single man page has been split into a number of separate man pages.
485 These also give rise to individual HTML pages which are put in a separate
486 directory. There is an index.html page that lists them all. Some hyperlinking
487 between the pages has been installed.
488
489
490 Release 3.5 15-Aug-01
491 ---------------------
492
493 1. The configuring system has been upgraded to use later versions of autoconf
494 and libtool. By default it builds both a shared and a static library if the OS
495 supports it. You can use --disable-shared or --disable-static on the configure
496 command if you want only one of them.
497
498 2. The pcretest utility is now installed along with pcregrep because it is
499 useful for users (to test regexs) and by doing this, it automatically gets
500 relinked by libtool. The documentation has been turned into a man page, so
501 there are now .1, .txt, and .html versions in /doc.
502
503 3. Upgrades to pcregrep:
504 (i) Added long-form option names like gnu grep.
505 (ii) Added --help to list all options with an explanatory phrase.
506 (iii) Added -r, --recursive to recurse into sub-directories.
507 (iv) Added -f, --file to read patterns from a file.
508
509 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
510 script, to force use of CR or LF instead of \n in the source. On non-Unix
511 systems, the value can be set in config.h.
512
513 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
514 absolute limit. Changed the text of the error message to make this clear, and
515 likewise updated the man page.
516
517 6. The limit of 99 on the number of capturing subpatterns has been removed.
518 The new limit is 65535, which I hope will not be a "real" limit.
519
520
521 Release 3.3 01-Aug-00
522 ---------------------
523
524 There is some support for UTF-8 character strings. This is incomplete and
525 experimental. The documentation describes what is and what is not implemented.
526 Otherwise, this is just a bug-fixing release.
527
528
529 Release 3.0 01-Feb-00
530 ---------------------
531
532 1. A "configure" script is now used to configure PCRE for Unix systems. It
533 builds a Makefile, a config.h file, and the pcre-config script.
534
535 2. PCRE is built as a shared library by default.
536
537 3. There is support for POSIX classes such as [:alpha:].
538
539 5. There is an experimental recursion feature.
540
541 ----------------------------------------------------------------------------
542 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
543
544 Please note that there has been a change in the API such that a larger
545 ovector is required at matching time, to provide some additional workspace.
546 The new man page has details. This change was necessary in order to support
547 some of the new functionality in Perl 5.005.
548
549 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
550
551 Another (I hope this is the last!) change has been made to the API for the
552 pcre_compile() function. An additional argument has been added to make it
553 possible to pass over a pointer to character tables built in the current
554 locale by pcre_maketables(). To use the default tables, this new arguement
555 should be passed as NULL.
556
557 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
558
559 Yet another (and again I hope this really is the last) change has been made
560 to the API for the pcre_exec() function. An additional argument has been
561 added to make it possible to start the match other than at the start of the
562 subject string. This is important if there are lookbehinds. The new man
563 page has the details, but you just want to convert existing programs, all
564 you need to do is to stick in a new fifth argument to pcre_exec(), with a
565 value of zero. For example, change
566
567 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
568 to
569 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
570
571 ****

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