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Revision 836 - (hide annotations) (download)
Wed Dec 28 17:16:11 2011 UTC (3 years, 3 months ago) by ph10
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Merging all the changes from the pcre16 branch into the trunk.

1 nigel 41 News about PCRE releases
2     ------------------------
4 ph10 836 Release 8.21 12-Dec-2011
5     ------------------------
7     This is almost entirely a bug-fix release. The only new feature is the ability
8     to obtain the size of the memory used by the JIT compiler.
11 ph10 738 Release 8.20 21-Oct-2011
12     ------------------------
13 ph10 672
14 ph10 691 The main change in this release is the inclusion of Zoltan Herczeg's
15 ph10 672 just-in-time compiler support, which can be accessed by building PCRE with
16     --enable-jit. Large performance benefits can be had in many situations. 8.20
17     also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
18 ph10 738 a number of infelicities and differences from Perl.
19 ph10 672
21 ph10 659 Release 8.13 16-Aug-2011
22 ph10 654 ------------------------
24     This is mainly a bug-fix release. There has been a lot of internal refactoring.
25     The Unicode tables have been updated. The only new feature in the library is
26     the passing of *MARK information to callouts. Some additions have been made to
27     pcretest to make testing easier and more comprehensive. There is a new option
28     for pcregrep to adjust its internal buffer size.
31 ph10 588 Release 8.12 15-Jan-2011
32     ------------------------
34 ph10 589 This release fixes some bugs in pcregrep, one of which caused the tests to fail
35 ph10 588 on 64-bit big-endian systems. There are no changes to the code of the library.
38 ph10 581 Release 8.11 10-Dec-2010
39 ph10 579 ------------------------
41     A number of bugs in the library and in pcregrep have been fixed. As always, see
42     ChangeLog for details. The following are the non-bug-fix changes:
44     . Added --match-limit and --recursion-limit to pcregrep.
46     . Added an optional parentheses number to the -o and --only-matching options
47     of pcregrep.
49     . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
50     \B.
52     . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
53     bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
55     . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
56     START_OPTIMIZE option, which is now allowed at compile time
59 ph10 548 Release 8.10 25-Jun-2010
60 ph10 535 ------------------------
62 ph10 545 There are two major additions: support for (*MARK) and friends, and the option
63 ph10 535 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
64     opposites) so that they make use of Unicode properties. There are also a number
65     of lesser new features, and several bugs have been fixed. A new option,
66     --line-buffered, has been added to pcregrep, for use when it is connected to
67     pipes.
70 ph10 508 Release 8.02 19-Mar-2010
71 ph10 507 ------------------------
73     Another bug-fix release.
76 ph10 489 Release 8.01 19-Jan-2010
77     ------------------------
79     This is a bug-fix release. Several bugs in the code itself and some bugs and
80     infelicities in the build system have been fixed.
83 ph10 469 Release 8.00 19-Oct-09
84 ph10 461 ----------------------
86     Bugs have been fixed in the library and in pcregrep. There are also some
87     enhancements. Restrictions on patterns used for partial matching have been
88     removed, extra information is given for partial matches, the partial matching
89     process has been improved, and an option to make a partial match override a
90     full match is available. The "study" process has been enhanced by finding a
91     lower bound matching length. Groups with duplicate numbers may now have
92     duplicated names without the use of PCRE_DUPNAMES. However, they may not have
93     different names. The documentation has been revised to reflect these changes.
94     The version number has been expanded to 3 digits as it is clear that the rate
95     of change is not slowing down.
98 ph10 415 Release 7.9 11-Apr-09
99 ph10 411 ---------------------
100 ph10 345
101 ph10 411 Mostly bugfixes and tidies with just a couple of minor functional additions.
104 ph10 374 Release 7.8 05-Sep-08
105 ph10 371 ---------------------
107     More bug fixes, plus a performance improvement in Unicode character property
108     lookup.
111 ph10 347 Release 7.7 07-May-08
112 ph10 345 ---------------------
114     This is once again mainly a bug-fix release, but there are a couple of new
115     features.
118 ph10 319 Release 7.6 28-Jan-08
119 ph10 309 ---------------------
121     The main reason for having this release so soon after 7.5 is because it fixes a
122     potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
123     addition, the CMake configuration files have been brought up to date.
126 ph10 298 Release 7.5 10-Jan-08
127 ph10 289 ---------------------
128 ph10 122
129 ph10 289 This is mainly a bug-fix release. However the ability to link pcregrep with
130     libz or libbz2 and the ability to link pcretest with libreadline have been
131     added. Also the --line-offsets and --file-offsets options were added to
132     pcregrep.
135 ph10 260 Release 7.4 21-Sep-07
136 ph10 242 ---------------------
138 ph10 243 The only change of specification is the addition of options to control whether
139 ph10 242 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
140 ph10 243 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
141 ph10 261 relocations needed in a shared library. There have also been some documentation
142     updates, in particular, some more information about using CMake to build PCRE
143     has been added to the NON-UNIX-USE file.
144 ph10 242
146 ph10 228 Release 7.3 28-Aug-07
147 ph10 212 ---------------------
149     Most changes are bug fixes. Some that are not:
151     1. There is some support for Perl 5.10's experimental "backtracking control
152     verbs" such as (*PRUNE).
154     2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
155     restrictive in the strings it accepts.
157     3. Checking for potential integer overflow has been made more dynamic, and as a
158     consequence there is no longer a hard limit on the size of a subpattern that
159     has a limited repeat count.
160 ph10 227
161     4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
162     no longer advance by two characters instead of one when an unanchored match
163     fails at CRLF if there are explicit CR or LF matches within the pattern.
164 ph10 226 This gets rid of some anomalous effects that previously occurred.
165 ph10 212
166 ph10 227 5. Some PCRE-specific settings for varying the newline options at the start of
167     a pattern have been added.
168 ph10 212
169 ph10 227
170 ph10 184 Release 7.2 19-Jun-07
171 ph10 157 ---------------------
173 ph10 172 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
174 ph10 181 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
175     and \V).
176 ph10 168
177 ph10 159 Correction to the notes for 7.1: the note about shared libraries for Windows is
178     wrong. Previously, three libraries were built, but each could function
179     independently. For example, the pcreposix library also included all the
180     functions from the basic pcre library. The change is that the three libraries
181     are no longer independent. They are like the Unix libraries. To use the
182     pcreposix functions, for example, you need to link with both the pcreposix and
183 ph10 157 the basic pcre library.
185 ph10 166 Some more features from Perl 5.10 have been added:
186 ph10 157
187 ph10 166 (?-n) and (?+n) relative references for recursion and subroutines.
188 ph10 172
189     (?(-n) and (?(+n) relative references as conditions.
190 ph10 182
191 ph10 181 \k{name} and \g{name} are synonyms for \k<name>.
192 ph10 172
193 ph10 168 \K to reset the start of the matched string; for example, (foo)\Kbar
194 ph10 175 matches bar preceded by foo, but only sets bar as the matched string.
195 ph10 182
196     (?| introduces a group where the capturing parentheses in each alternative
197     start from the same number; for example, (?|(abc)|(xyz)) sets capturing
198 ph10 175 parentheses number 1 in both cases.
199 ph10 166
200 ph10 182 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
201 ph10 166
202 ph10 182
203 ph10 155 Release 7.1 24-Apr-07
204 nigel 93 ---------------------
206 ph10 155 There is only one new feature in this release: a linebreak setting of
207     PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
208     recognizes only CRLF, CR, and LF as linebreaks.
209 ph10 122
210 ph10 155 A few bugs are fixed (see ChangeLog for details), but the major change is a
211     complete re-implementation of the build system. This now has full Autotools
212     support and so is now "standard" in some sense. It should help with compiling
213     PCRE in a wide variety of environments.
215 ph10 146 NOTE: when building shared libraries for Windows, three dlls are now built,
216     called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
217     included in a single dll.
219     Another important change is that the dftables auxiliary program is no longer
220 ph10 128 compiled and run at "make" time by default. Instead, a default set of character
221     tables (assuming ASCII coding) is used. If you want to use dftables to generate
222     the character tables as previously, add --enable-rebuild-chartables to the
223     "configure" command. You must do this if you are compiling PCRE to run on a
224     system that uses EBCDIC code.
225 ph10 122
226 ph10 128 There is a discussion about character tables in the README file. The default is
227     not to use dftables so that that there is no problem when cross-compiling.
230 ph10 122 Release 7.0 19-Dec-06
231     ---------------------
233 nigel 93 This release has a new major number because there have been some internal
234     upheavals to facilitate the addition of new optimizations and other facilities,
235     and to make subsequent maintenance and extension easier. Compilation is likely
236     to be a bit slower, but there should be no major effect on runtime performance.
237     Previously compiled patterns are NOT upwards compatible with this release. If
238     you have saved compiled patterns from a previous release, you will have to
239     re-compile them. Important changes that are visible to users are:
241     1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
242     some more scripts.
244     2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
245     sequence as a newline.
247     3. The \R escape matches a single Unicode newline sequence as a single unit.
249     4. New features that will appear in Perl 5.10 are now in PCRE. These include
250     alternative Perl syntax for named parentheses, and Perl syntax for
251     recursion.
253     5. The C++ wrapper interface has been extended by the addition of a
254     QuoteMeta function and the ability to allow copy construction and
255     assignment.
257     For a complete list of changes, see the ChangeLog file.
260 nigel 91 Release 6.7 04-Jul-06
261     ---------------------
263     The main additions to this release are the ability to use the same name for
264     multiple sets of parentheses, and support for CRLF line endings in both the
265     library and pcregrep (and in pcretest for testing).
267     Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
268     significantly reduced for certain subject strings.
271 nigel 87 Release 6.5 01-Feb-06
272     ---------------------
274     Important changes in this release:
276     1. A number of new features have been added to pcregrep.
278     2. The Unicode property tables have been updated to Unicode 4.1.0, and the
279     supported properties have been extended with script names such as "Arabic",
280     and the derived properties "Any" and "L&". This has necessitated a change to
281     the interal format of compiled patterns. Any saved compiled patterns that
282     use \p or \P must be recompiled.
284     3. The specification of recursion in patterns has been changed so that all
285     recursive subpatterns are automatically treated as atomic groups. Thus, for
286     example, (?R) is treated as if it were (?>(?R)). This is necessary because
287     otherwise there are situations where recursion does not work.
289     See the ChangeLog for a complete list of changes, which include a number of bug
290     fixes and tidies.
293 nigel 77 Release 6.0 07-Jun-05
294     ---------------------
296     The release number has been increased to 6.0 because of the addition of several
297     major new pieces of functionality.
299     A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
300     algorithm, has been added. This has a number of advantages for certain cases,
301     though it does run more slowly, and lacks the ability to capture substrings. On
302     the other hand, it does find all matches, not just the first, and it works
303     better for partial matching. The pcrematching man page discusses the
304     differences.
306     The pcretest program has been enhanced so that it can make use of the new
307     pcre_dfa_exec() matching function and the extra features it provides.
309     The distribution now includes a C++ wrapper library. This is built
310     automatically if a C++ compiler is found. The pcrecpp man page discusses this
311     interface.
313     The code itself has been re-organized into many more files, one for each
314     function, so it no longer requires everything to be linked in when static
315     linkage is used. As a consequence, some internal functions have had to have
316     their names exposed. These functions all have names starting with _pcre_. They
317     are undocumented, and are not intended for use by outside callers.
319     The pcregrep program has been enhanced with new functionality such as
320     multiline-matching and options for output more matching context. See the
321     ChangeLog for a complete list of changes to the library and the utility
322     programs.
325 nigel 75 Release 5.0 13-Sep-04
326     ---------------------
328     The licence under which PCRE is released has been changed to the more
329     conventional "BSD" licence.
331     In the code, some bugs have been fixed, and there are also some major changes
332     in this release (which is why I've increased the number to 5.0). Some changes
333     are internal rearrangements, and some provide a number of new facilities. The
334     new features are:
336     1. There's an "automatic callout" feature that inserts callouts before every
337     item in the regex, and there's a new callout field that gives the position
338     in the pattern - useful for debugging and tracing.
340     2. The extra_data structure can now be used to pass in a set of character
341     tables at exec time. This is useful if compiled regex are saved and re-used
342     at a later time when the tables may not be at the same address. If the
343     default internal tables are used, the pointer saved with the compiled
344     pattern is now set to NULL, which means that you don't need to do anything
345     special unless you are using custom tables.
347     3. It is possible, with some restrictions on the content of the regex, to
348     request "partial" matching. A special return code is given if all of the
349     subject string matched part of the regex. This could be useful for testing
350     an input field as it is being typed.
352     4. There is now some optional support for Unicode character properties, which
353     means that the patterns items such as \p{Lu} and \X can now be used. Only
354     the general category properties are supported. If PCRE is compiled with this
355     support, an additional 90K data structure is include, which increases the
356     size of the library dramatically.
358     5. There is support for saving compiled patterns and re-using them later.
360     6. There is support for running regular expressions that were compiled on a
361     different host with the opposite endianness.
363     7. The pcretest program has been extended to accommodate the new features.
365     The main internal rearrangement is that sequences of literal characters are no
366     longer handled as strings. Instead, each character is handled on its own. This
367     makes some UTF-8 handling easier, and makes the support of partial matching
368     possible. Compiled patterns containing long literal strings will be larger as a
369     result of this change; I hope that performance will not be much affected.
372 nigel 73 Release 4.5 01-Dec-03
373     ---------------------
375     Again mainly a bug-fix and tidying release, with only a couple of new features:
377     1. It's possible now to compile PCRE so that it does not use recursive
378     function calls when matching. Instead it gets memory from the heap. This slows
379     things down, but may be necessary on systems with limited stacks.
381     2. UTF-8 string checking has been tightened to reject overlong sequences and to
382     check that a starting offset points to the start of a character. Failure of the
383     latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
385     3. PCRE can now be compiled for systems that use EBCDIC code.
388 nigel 71 Release 4.4 21-Aug-03
389     ---------------------
391     This is mainly a bug-fix and tidying release. The only new feature is that PCRE
392     checks UTF-8 strings for validity by default. There is an option to suppress
393     this, just in case anybody wants that teeny extra bit of performance.
396     Releases 4.1 - 4.3
397     ------------------
399     Sorry, I forgot about updating the NEWS file for these releases. Please take a
400     look at ChangeLog.
403 nigel 63 Release 4.0 17-Feb-03
404     ---------------------
406     There have been a lot of changes for the 4.0 release, adding additional
407     functionality and mending bugs. Below is a list of the highlights of the new
408     functionality. For full details of these features, please consult the
409     documentation. For a complete list of changes, see the ChangeLog file.
411     1. Support for Perl's \Q...\E escapes.
413     2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
414     package. They provide some syntactic sugar for simple cases of "atomic
415     grouping".
417     3. Support for the \G assertion. It is true when the current matching position
418     is at the start point of the match.
420     4. A new feature that provides some of the functionality that Perl provides
421     with (?{...}). The facility is termed a "callout". The way it is done in PCRE
422     is for the caller to provide an optional function, by setting pcre_callout to
423     its entry point. To get the function called, the regex must include (?C) at
424     appropriate points.
426     5. Support for recursive calls to individual subpatterns. This makes it really
427     easy to get totally confused.
429     6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
430     name a group.
432     7. Several extensions to UTF-8 support; it is now fairly complete. There is an
433     option for pcregrep to make it operate in UTF-8 mode.
435     8. The single man page has been split into a number of separate man pages.
436     These also give rise to individual HTML pages which are put in a separate
437     directory. There is an index.html page that lists them all. Some hyperlinking
438     between the pages has been installed.
441 nigel 53 Release 3.5 15-Aug-01
442     ---------------------
444     1. The configuring system has been upgraded to use later versions of autoconf
445     and libtool. By default it builds both a shared and a static library if the OS
446     supports it. You can use --disable-shared or --disable-static on the configure
447     command if you want only one of them.
449     2. The pcretest utility is now installed along with pcregrep because it is
450     useful for users (to test regexs) and by doing this, it automatically gets
451     relinked by libtool. The documentation has been turned into a man page, so
452     there are now .1, .txt, and .html versions in /doc.
454     3. Upgrades to pcregrep:
455     (i) Added long-form option names like gnu grep.
456     (ii) Added --help to list all options with an explanatory phrase.
457     (iii) Added -r, --recursive to recurse into sub-directories.
458     (iv) Added -f, --file to read patterns from a file.
460     4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
461     script, to force use of CR or LF instead of \n in the source. On non-Unix
462     systems, the value can be set in config.h.
464     5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
465     absolute limit. Changed the text of the error message to make this clear, and
466     likewise updated the man page.
468     6. The limit of 99 on the number of capturing subpatterns has been removed.
469     The new limit is 65535, which I hope will not be a "real" limit.
472 nigel 49 Release 3.3 01-Aug-00
473     ---------------------
475     There is some support for UTF-8 character strings. This is incomplete and
476     experimental. The documentation describes what is and what is not implemented.
477     Otherwise, this is just a bug-fixing release.
480 nigel 43 Release 3.0 01-Feb-00
481     ---------------------
482 nigel 41
483 nigel 43 1. A "configure" script is now used to configure PCRE for Unix systems. It
484     builds a Makefile, a config.h file, and the pcre-config script.
486     2. PCRE is built as a shared library by default.
488     3. There is support for POSIX classes such as [:alpha:].
490     5. There is an experimental recursion feature.
492 nigel 41 ----------------------------------------------------------------------------
495     Please note that there has been a change in the API such that a larger
496     ovector is required at matching time, to provide some additional workspace.
497     The new man page has details. This change was necessary in order to support
498     some of the new functionality in Perl 5.005.
502     Another (I hope this is the last!) change has been made to the API for the
503     pcre_compile() function. An additional argument has been added to make it
504     possible to pass over a pointer to character tables built in the current
505     locale by pcre_maketables(). To use the default tables, this new arguement
506     should be passed as NULL.
510     Yet another (and again I hope this really is the last) change has been made
511     to the API for the pcre_exec() function. An additional argument has been
512     added to make it possible to start the match other than at the start of the
513     subject string. This is important if there are lookbehinds. The new man
514     page has the details, but you just want to convert existing programs, all
515     you need to do is to stick in a new fifth argument to pcre_exec(), with a
516     value of zero. For example, change
518     pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
519     to
520     pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
522     ****


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