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Revision 672 - (hide annotations) (download)
Tue Aug 23 16:45:55 2011 UTC (3 years, 7 months ago) by ph10
File size: 20514 byte(s)
Update non-manpage documentation for JIT.

1 nigel 41 News about PCRE releases
2     ------------------------
4 ph10 672 Release 8.20
5     ------------
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.
14 ph10 659 Release 8.13 16-Aug-2011
15 ph10 654 ------------------------
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.
24 ph10 588 Release 8.12 15-Jan-2011
25     ------------------------
27 ph10 589 This release fixes some bugs in pcregrep, one of which caused the tests to fail
28 ph10 588 on 64-bit big-endian systems. There are no changes to the code of the library.
31 ph10 581 Release 8.11 10-Dec-2010
32 ph10 579 ------------------------
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:
37     . Added --match-limit and --recursion-limit to pcregrep.
39     . Added an optional parentheses number to the -o and --only-matching options
40     of pcregrep.
42     . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
43     \B.
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.
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
52 ph10 548 Release 8.10 25-Jun-2010
53 ph10 535 ------------------------
55 ph10 545 There are two major additions: support for (*MARK) and friends, and the option
56 ph10 535 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.
63 ph10 508 Release 8.02 19-Mar-2010
64 ph10 507 ------------------------
66     Another bug-fix release.
69 ph10 489 Release 8.01 19-Jan-2010
70     ------------------------
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.
76 ph10 469 Release 8.00 19-Oct-09
77 ph10 461 ----------------------
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.
91 ph10 415 Release 7.9 11-Apr-09
92 ph10 411 ---------------------
93 ph10 345
94 ph10 411 Mostly bugfixes and tidies with just a couple of minor functional additions.
97 ph10 374 Release 7.8 05-Sep-08
98 ph10 371 ---------------------
100     More bug fixes, plus a performance improvement in Unicode character property
101     lookup.
104 ph10 347 Release 7.7 07-May-08
105 ph10 345 ---------------------
107     This is once again mainly a bug-fix release, but there are a couple of new
108     features.
111 ph10 319 Release 7.6 28-Jan-08
112 ph10 309 ---------------------
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.
119 ph10 298 Release 7.5 10-Jan-08
120 ph10 289 ---------------------
121 ph10 122
122 ph10 289 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.
128 ph10 260 Release 7.4 21-Sep-07
129 ph10 242 ---------------------
131 ph10 243 The only change of specification is the addition of options to control whether
132 ph10 242 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
133 ph10 243 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
134 ph10 261 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 ph10 242
139 ph10 228 Release 7.3 28-Aug-07
140 ph10 212 ---------------------
142     Most changes are bug fixes. Some that are not:
144     1. There is some support for Perl 5.10's experimental "backtracking control
145     verbs" such as (*PRUNE).
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.
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 ph10 227
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 ph10 226 This gets rid of some anomalous effects that previously occurred.
158 ph10 212
159 ph10 227 5. Some PCRE-specific settings for varying the newline options at the start of
160     a pattern have been added.
161 ph10 212
162 ph10 227
163 ph10 184 Release 7.2 19-Jun-07
164 ph10 157 ---------------------
166 ph10 172 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
167 ph10 181 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
168     and \V).
169 ph10 168
170 ph10 159 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 ph10 157 the basic pcre library.
178 ph10 166 Some more features from Perl 5.10 have been added:
179 ph10 157
180 ph10 166 (?-n) and (?+n) relative references for recursion and subroutines.
181 ph10 172
182     (?(-n) and (?(+n) relative references as conditions.
183 ph10 182
184 ph10 181 \k{name} and \g{name} are synonyms for \k<name>.
185 ph10 172
186 ph10 168 \K to reset the start of the matched string; for example, (foo)\Kbar
187 ph10 175 matches bar preceded by foo, but only sets bar as the matched string.
188 ph10 182
189     (?| introduces a group where the capturing parentheses in each alternative
190     start from the same number; for example, (?|(abc)|(xyz)) sets capturing
191 ph10 175 parentheses number 1 in both cases.
192 ph10 166
193 ph10 182 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
194 ph10 166
195 ph10 182
196 ph10 155 Release 7.1 24-Apr-07
197 nigel 93 ---------------------
199 ph10 155 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 ph10 122
203 ph10 155 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.
208 ph10 146 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.
212     Another important change is that the dftables auxiliary program is no longer
213 ph10 128 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 ph10 122
219 ph10 128 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.
223 ph10 122 Release 7.0 19-Dec-06
224     ---------------------
226 nigel 93 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:
234     1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
235     some more scripts.
237     2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
238     sequence as a newline.
240     3. The \R escape matches a single Unicode newline sequence as a single unit.
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.
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.
250     For a complete list of changes, see the ChangeLog file.
253 nigel 91 Release 6.7 04-Jul-06
254     ---------------------
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).
260     Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
261     significantly reduced for certain subject strings.
264 nigel 87 Release 6.5 01-Feb-06
265     ---------------------
267     Important changes in this release:
269     1. A number of new features have been added to pcregrep.
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.
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.
282     See the ChangeLog for a complete list of changes, which include a number of bug
283     fixes and tidies.
286 nigel 77 Release 6.0 07-Jun-05
287     ---------------------
289     The release number has been increased to 6.0 because of the addition of several
290     major new pieces of functionality.
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.
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.
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.
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.
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.
318 nigel 75 Release 5.0 13-Sep-04
319     ---------------------
321     The licence under which PCRE is released has been changed to the more
322     conventional "BSD" licence.
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:
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.
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.
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.
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.
351     5. There is support for saving compiled patterns and re-using them later.
353     6. There is support for running regular expressions that were compiled on a
354     different host with the opposite endianness.
356     7. The pcretest program has been extended to accommodate the new features.
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.
365 nigel 73 Release 4.5 01-Dec-03
366     ---------------------
368     Again mainly a bug-fix and tidying release, with only a couple of new features:
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.
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.
378     3. PCRE can now be compiled for systems that use EBCDIC code.
381 nigel 71 Release 4.4 21-Aug-03
382     ---------------------
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.
389     Releases 4.1 - 4.3
390     ------------------
392     Sorry, I forgot about updating the NEWS file for these releases. Please take a
393     look at ChangeLog.
396 nigel 63 Release 4.0 17-Feb-03
397     ---------------------
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.
404     1. Support for Perl's \Q...\E escapes.
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".
410     3. Support for the \G assertion. It is true when the current matching position
411     is at the start point of the match.
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.
419     5. Support for recursive calls to individual subpatterns. This makes it really
420     easy to get totally confused.
422     6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
423     name a group.
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.
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.
434 nigel 53 Release 3.5 15-Aug-01
435     ---------------------
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.
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.
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.
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.
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.
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.
465 nigel 49 Release 3.3 01-Aug-00
466     ---------------------
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.
473 nigel 43 Release 3.0 01-Feb-00
474     ---------------------
475 nigel 41
476 nigel 43 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.
479     2. PCRE is built as a shared library by default.
481     3. There is support for POSIX classes such as [:alpha:].
483     5. There is an experimental recursion feature.
485 nigel 41 ----------------------------------------------------------------------------
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.
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.
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
511     pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
512     to
513     pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
515     ****


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