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Revision 508 - (show annotations)
Fri Mar 19 10:26:03 2010 UTC (11 years, 7 months ago) by ph10
File size: 18364 byte(s)
Adjust version and date for 8.02 release.
1 News about PCRE releases
2 ------------------------
4 Release 8.02 19-Mar-2010
5 ------------------------
7 Another bug-fix release.
10 Release 8.01 19-Jan-2010
11 ------------------------
13 This is a bug-fix release. Several bugs in the code itself and some bugs and
14 infelicities in the build system have been fixed.
17 Release 8.00 19-Oct-09
18 ----------------------
20 Bugs have been fixed in the library and in pcregrep. There are also some
21 enhancements. Restrictions on patterns used for partial matching have been
22 removed, extra information is given for partial matches, the partial matching
23 process has been improved, and an option to make a partial match override a
24 full match is available. The "study" process has been enhanced by finding a
25 lower bound matching length. Groups with duplicate numbers may now have
26 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
27 different names. The documentation has been revised to reflect these changes.
28 The version number has been expanded to 3 digits as it is clear that the rate
29 of change is not slowing down.
32 Release 7.9 11-Apr-09
33 ---------------------
35 Mostly bugfixes and tidies with just a couple of minor functional additions.
38 Release 7.8 05-Sep-08
39 ---------------------
41 More bug fixes, plus a performance improvement in Unicode character property
42 lookup.
45 Release 7.7 07-May-08
46 ---------------------
48 This is once again mainly a bug-fix release, but there are a couple of new
49 features.
52 Release 7.6 28-Jan-08
53 ---------------------
55 The main reason for having this release so soon after 7.5 is because it fixes a
56 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
57 addition, the CMake configuration files have been brought up to date.
60 Release 7.5 10-Jan-08
61 ---------------------
63 This is mainly a bug-fix release. However the ability to link pcregrep with
64 libz or libbz2 and the ability to link pcretest with libreadline have been
65 added. Also the --line-offsets and --file-offsets options were added to
66 pcregrep.
69 Release 7.4 21-Sep-07
70 ---------------------
72 The only change of specification is the addition of options to control whether
73 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
74 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
75 relocations needed in a shared library. There have also been some documentation
76 updates, in particular, some more information about using CMake to build PCRE
77 has been added to the NON-UNIX-USE file.
80 Release 7.3 28-Aug-07
81 ---------------------
83 Most changes are bug fixes. Some that are not:
85 1. There is some support for Perl 5.10's experimental "backtracking control
86 verbs" such as (*PRUNE).
88 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
89 restrictive in the strings it accepts.
91 3. Checking for potential integer overflow has been made more dynamic, and as a
92 consequence there is no longer a hard limit on the size of a subpattern that
93 has a limited repeat count.
95 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
96 no longer advance by two characters instead of one when an unanchored match
97 fails at CRLF if there are explicit CR or LF matches within the pattern.
98 This gets rid of some anomalous effects that previously occurred.
100 5. Some PCRE-specific settings for varying the newline options at the start of
101 a pattern have been added.
104 Release 7.2 19-Jun-07
105 ---------------------
107 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
108 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
109 and \V).
111 Correction to the notes for 7.1: the note about shared libraries for Windows is
112 wrong. Previously, three libraries were built, but each could function
113 independently. For example, the pcreposix library also included all the
114 functions from the basic pcre library. The change is that the three libraries
115 are no longer independent. They are like the Unix libraries. To use the
116 pcreposix functions, for example, you need to link with both the pcreposix and
117 the basic pcre library.
119 Some more features from Perl 5.10 have been added:
121 (?-n) and (?+n) relative references for recursion and subroutines.
123 (?(-n) and (?(+n) relative references as conditions.
125 \k{name} and \g{name} are synonyms for \k<name>.
127 \K to reset the start of the matched string; for example, (foo)\Kbar
128 matches bar preceded by foo, but only sets bar as the matched string.
130 (?| introduces a group where the capturing parentheses in each alternative
131 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
132 parentheses number 1 in both cases.
134 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
137 Release 7.1 24-Apr-07
138 ---------------------
140 There is only one new feature in this release: a linebreak setting of
141 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
142 recognizes only CRLF, CR, and LF as linebreaks.
144 A few bugs are fixed (see ChangeLog for details), but the major change is a
145 complete re-implementation of the build system. This now has full Autotools
146 support and so is now "standard" in some sense. It should help with compiling
147 PCRE in a wide variety of environments.
149 NOTE: when building shared libraries for Windows, three dlls are now built,
150 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
151 included in a single dll.
153 Another important change is that the dftables auxiliary program is no longer
154 compiled and run at "make" time by default. Instead, a default set of character
155 tables (assuming ASCII coding) is used. If you want to use dftables to generate
156 the character tables as previously, add --enable-rebuild-chartables to the
157 "configure" command. You must do this if you are compiling PCRE to run on a
158 system that uses EBCDIC code.
160 There is a discussion about character tables in the README file. The default is
161 not to use dftables so that that there is no problem when cross-compiling.
164 Release 7.0 19-Dec-06
165 ---------------------
167 This release has a new major number because there have been some internal
168 upheavals to facilitate the addition of new optimizations and other facilities,
169 and to make subsequent maintenance and extension easier. Compilation is likely
170 to be a bit slower, but there should be no major effect on runtime performance.
171 Previously compiled patterns are NOT upwards compatible with this release. If
172 you have saved compiled patterns from a previous release, you will have to
173 re-compile them. Important changes that are visible to users are:
175 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
176 some more scripts.
178 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
179 sequence as a newline.
181 3. The \R escape matches a single Unicode newline sequence as a single unit.
183 4. New features that will appear in Perl 5.10 are now in PCRE. These include
184 alternative Perl syntax for named parentheses, and Perl syntax for
185 recursion.
187 5. The C++ wrapper interface has been extended by the addition of a
188 QuoteMeta function and the ability to allow copy construction and
189 assignment.
191 For a complete list of changes, see the ChangeLog file.
194 Release 6.7 04-Jul-06
195 ---------------------
197 The main additions to this release are the ability to use the same name for
198 multiple sets of parentheses, and support for CRLF line endings in both the
199 library and pcregrep (and in pcretest for testing).
201 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
202 significantly reduced for certain subject strings.
205 Release 6.5 01-Feb-06
206 ---------------------
208 Important changes in this release:
210 1. A number of new features have been added to pcregrep.
212 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
213 supported properties have been extended with script names such as "Arabic",
214 and the derived properties "Any" and "L&". This has necessitated a change to
215 the interal format of compiled patterns. Any saved compiled patterns that
216 use \p or \P must be recompiled.
218 3. The specification of recursion in patterns has been changed so that all
219 recursive subpatterns are automatically treated as atomic groups. Thus, for
220 example, (?R) is treated as if it were (?>(?R)). This is necessary because
221 otherwise there are situations where recursion does not work.
223 See the ChangeLog for a complete list of changes, which include a number of bug
224 fixes and tidies.
227 Release 6.0 07-Jun-05
228 ---------------------
230 The release number has been increased to 6.0 because of the addition of several
231 major new pieces of functionality.
233 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
234 algorithm, has been added. This has a number of advantages for certain cases,
235 though it does run more slowly, and lacks the ability to capture substrings. On
236 the other hand, it does find all matches, not just the first, and it works
237 better for partial matching. The pcrematching man page discusses the
238 differences.
240 The pcretest program has been enhanced so that it can make use of the new
241 pcre_dfa_exec() matching function and the extra features it provides.
243 The distribution now includes a C++ wrapper library. This is built
244 automatically if a C++ compiler is found. The pcrecpp man page discusses this
245 interface.
247 The code itself has been re-organized into many more files, one for each
248 function, so it no longer requires everything to be linked in when static
249 linkage is used. As a consequence, some internal functions have had to have
250 their names exposed. These functions all have names starting with _pcre_. They
251 are undocumented, and are not intended for use by outside callers.
253 The pcregrep program has been enhanced with new functionality such as
254 multiline-matching and options for output more matching context. See the
255 ChangeLog for a complete list of changes to the library and the utility
256 programs.
259 Release 5.0 13-Sep-04
260 ---------------------
262 The licence under which PCRE is released has been changed to the more
263 conventional "BSD" licence.
265 In the code, some bugs have been fixed, and there are also some major changes
266 in this release (which is why I've increased the number to 5.0). Some changes
267 are internal rearrangements, and some provide a number of new facilities. The
268 new features are:
270 1. There's an "automatic callout" feature that inserts callouts before every
271 item in the regex, and there's a new callout field that gives the position
272 in the pattern - useful for debugging and tracing.
274 2. The extra_data structure can now be used to pass in a set of character
275 tables at exec time. This is useful if compiled regex are saved and re-used
276 at a later time when the tables may not be at the same address. If the
277 default internal tables are used, the pointer saved with the compiled
278 pattern is now set to NULL, which means that you don't need to do anything
279 special unless you are using custom tables.
281 3. It is possible, with some restrictions on the content of the regex, to
282 request "partial" matching. A special return code is given if all of the
283 subject string matched part of the regex. This could be useful for testing
284 an input field as it is being typed.
286 4. There is now some optional support for Unicode character properties, which
287 means that the patterns items such as \p{Lu} and \X can now be used. Only
288 the general category properties are supported. If PCRE is compiled with this
289 support, an additional 90K data structure is include, which increases the
290 size of the library dramatically.
292 5. There is support for saving compiled patterns and re-using them later.
294 6. There is support for running regular expressions that were compiled on a
295 different host with the opposite endianness.
297 7. The pcretest program has been extended to accommodate the new features.
299 The main internal rearrangement is that sequences of literal characters are no
300 longer handled as strings. Instead, each character is handled on its own. This
301 makes some UTF-8 handling easier, and makes the support of partial matching
302 possible. Compiled patterns containing long literal strings will be larger as a
303 result of this change; I hope that performance will not be much affected.
306 Release 4.5 01-Dec-03
307 ---------------------
309 Again mainly a bug-fix and tidying release, with only a couple of new features:
311 1. It's possible now to compile PCRE so that it does not use recursive
312 function calls when matching. Instead it gets memory from the heap. This slows
313 things down, but may be necessary on systems with limited stacks.
315 2. UTF-8 string checking has been tightened to reject overlong sequences and to
316 check that a starting offset points to the start of a character. Failure of the
317 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
319 3. PCRE can now be compiled for systems that use EBCDIC code.
322 Release 4.4 21-Aug-03
323 ---------------------
325 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
326 checks UTF-8 strings for validity by default. There is an option to suppress
327 this, just in case anybody wants that teeny extra bit of performance.
330 Releases 4.1 - 4.3
331 ------------------
333 Sorry, I forgot about updating the NEWS file for these releases. Please take a
334 look at ChangeLog.
337 Release 4.0 17-Feb-03
338 ---------------------
340 There have been a lot of changes for the 4.0 release, adding additional
341 functionality and mending bugs. Below is a list of the highlights of the new
342 functionality. For full details of these features, please consult the
343 documentation. For a complete list of changes, see the ChangeLog file.
345 1. Support for Perl's \Q...\E escapes.
347 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
348 package. They provide some syntactic sugar for simple cases of "atomic
349 grouping".
351 3. Support for the \G assertion. It is true when the current matching position
352 is at the start point of the match.
354 4. A new feature that provides some of the functionality that Perl provides
355 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
356 is for the caller to provide an optional function, by setting pcre_callout to
357 its entry point. To get the function called, the regex must include (?C) at
358 appropriate points.
360 5. Support for recursive calls to individual subpatterns. This makes it really
361 easy to get totally confused.
363 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
364 name a group.
366 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
367 option for pcregrep to make it operate in UTF-8 mode.
369 8. The single man page has been split into a number of separate man pages.
370 These also give rise to individual HTML pages which are put in a separate
371 directory. There is an index.html page that lists them all. Some hyperlinking
372 between the pages has been installed.
375 Release 3.5 15-Aug-01
376 ---------------------
378 1. The configuring system has been upgraded to use later versions of autoconf
379 and libtool. By default it builds both a shared and a static library if the OS
380 supports it. You can use --disable-shared or --disable-static on the configure
381 command if you want only one of them.
383 2. The pcretest utility is now installed along with pcregrep because it is
384 useful for users (to test regexs) and by doing this, it automatically gets
385 relinked by libtool. The documentation has been turned into a man page, so
386 there are now .1, .txt, and .html versions in /doc.
388 3. Upgrades to pcregrep:
389 (i) Added long-form option names like gnu grep.
390 (ii) Added --help to list all options with an explanatory phrase.
391 (iii) Added -r, --recursive to recurse into sub-directories.
392 (iv) Added -f, --file to read patterns from a file.
394 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
395 script, to force use of CR or LF instead of \n in the source. On non-Unix
396 systems, the value can be set in config.h.
398 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
399 absolute limit. Changed the text of the error message to make this clear, and
400 likewise updated the man page.
402 6. The limit of 99 on the number of capturing subpatterns has been removed.
403 The new limit is 65535, which I hope will not be a "real" limit.
406 Release 3.3 01-Aug-00
407 ---------------------
409 There is some support for UTF-8 character strings. This is incomplete and
410 experimental. The documentation describes what is and what is not implemented.
411 Otherwise, this is just a bug-fixing release.
414 Release 3.0 01-Feb-00
415 ---------------------
417 1. A "configure" script is now used to configure PCRE for Unix systems. It
418 builds a Makefile, a config.h file, and the pcre-config script.
420 2. PCRE is built as a shared library by default.
422 3. There is support for POSIX classes such as [:alpha:].
424 5. There is an experimental recursion feature.
426 ----------------------------------------------------------------------------
429 Please note that there has been a change in the API such that a larger
430 ovector is required at matching time, to provide some additional workspace.
431 The new man page has details. This change was necessary in order to support
432 some of the new functionality in Perl 5.005.
436 Another (I hope this is the last!) change has been made to the API for the
437 pcre_compile() function. An additional argument has been added to make it
438 possible to pass over a pointer to character tables built in the current
439 locale by pcre_maketables(). To use the default tables, this new arguement
440 should be passed as NULL.
444 Yet another (and again I hope this really is the last) change has been made
445 to the API for the pcre_exec() function. An additional argument has been
446 added to make it possible to start the match other than at the start of the
447 subject string. This is important if there are lookbehinds. The new man
448 page has the details, but you just want to convert existing programs, all
449 you need to do is to stick in a new fifth argument to pcre_exec(), with a
450 value of zero. For example, change
452 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
453 to
454 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
456 ****


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