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Revision 545 - (show annotations) (download)
Wed Jun 16 10:51:15 2010 UTC (4 years, 1 month ago) by ph10
File size: 18803 byte(s)
Tidyup for 8.10-RC2 test release.

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

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