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Revision 672 - (show annotations) (download)
Tue Aug 23 16:45:55 2011 UTC (3 years ago) by ph10
File size: 20514 byte(s)
Update non-manpage documentation for JIT.

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

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