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Sun Dec 15 17:01:46 2013 UTC (5 years, 11 months ago) by ph10
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Final file tidies for 8.34.
1 News about PCRE releases
2 ------------------------
4 Release 8.34 15-December-2013
5 -----------------------------
7 As well as fixing the inevitable bugs, performance has been improved by
8 refactoring and extending the amount of "auto-possessification" that PCRE does.
9 Other notable changes:
11 . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
12 an empty string. If it can, pcretest shows this in its information output.
14 . A back reference to a named subpattern when there is more than one of the
15 same name now checks them in the order in which they appear in the pattern.
16 The first one that is set is used for the reference. Previously only the
17 first one was inspected. This change makes PCRE more compatible with Perl.
19 . Unicode character properties were updated from Unicode 6.3.0.
21 . The character VT has been added to the set of characters that match \s and
22 are generally treated as white space, following this same change in Perl
23 5.18. There is now no difference between "Perl space" and "POSIX space".
25 . Perl has changed its handling of \8 and \9. If there is no previously
26 encountered capturing group of those numbers, they are treated as the
27 literal characters 8 and 9 instead of a binary zero followed by the
28 literals. PCRE now does the same.
30 . Following Perl, added \o{} to specify codepoints in octal, making it
31 possible to specify values greater than 0777 and also making them
32 unambiguous.
34 . In UCP mode, \s was not matching two of the characters that Perl matches,
35 namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
36 were matched by \h.
38 . Add JIT support for the 64 bit TileGX architecture.
40 . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
41 [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
42 does in Unicode mode.
44 . Perl no longer allows group names to start with digits, so I have made this
45 change also in PCRE.
47 . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
48 mean "start of word" and "end of word", respectively, as a transition aid.
51 Release 8.33 28-May-2013
52 --------------------------
54 A number of bugs are fixed, and some performance improvements have been made.
55 There are also some new features, of which these are the most important:
57 . The behaviour of the backtracking verbs has been rationalized and
58 documented in more detail.
60 . JIT now supports callouts and all of the backtracking verbs.
62 . Unicode validation has been updated in the light of Unicode Corrigendum #9,
63 which points out that "non characters" are not "characters that may not
64 appear in Unicode strings" but rather "characters that are reserved for
65 internal use and have only local meaning".
67 . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
68 creator of a pattern can specify lower (but not higher) limits for the
69 matching process.
71 . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
72 the (*UTF) feature, as this could be a security issue.
75 Release 8.32 30-November-2012
76 -----------------------------
78 This release fixes a number of bugs, but also has some new features. These are
79 the highlights:
81 . There is now support for 32-bit character strings and UTF-32. Like the
82 16-bit support, this is done by compiling a separate 32-bit library.
84 . \X now matches a Unicode extended grapheme cluster.
86 . Case-independent matching of Unicode characters that have more than one
87 "other case" now makes all three (or more) characters equivalent. This
88 applies, for example, to Greek Sigma, which has two lowercase versions.
90 . Unicode character properties are updated to Unicode 6.2.0.
92 . The EBCDIC support, which had decayed, has had a spring clean.
94 . A number of JIT optimizations have been added, which give faster JIT
95 execution speed. In addition, a new direct interface to JIT execution is
96 available. This bypasses some of the sanity checks of pcre_exec() to give a
97 noticeable speed-up.
99 . A number of issues in pcregrep have been fixed, making it more compatible
100 with GNU grep. In particular, --exclude and --include (and variants) apply
101 to all files now, not just those obtained from scanning a directory
102 recursively. In Windows environments, the default action for directories is
103 now "skip" instead of "read" (which provokes an error).
105 . If the --only-matching (-o) option in pcregrep is specified multiple
106 times, each one causes appropriate output. For example, -o1 -o2 outputs the
107 substrings matched by the 1st and 2nd capturing parentheses. A separating
108 string can be specified by --om-separator (default empty).
110 . When PCRE is built via Autotools using a version of gcc that has the
111 "visibility" feature, it is used to hide internal library functions that are
112 not part of the public API.
115 Release 8.31 06-July-2012
116 -------------------------
118 This is mainly a bug-fixing release, with a small number of developments:
120 . The JIT compiler now supports partial matching and the (*MARK) and
121 (*COMMIT) verbs.
123 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
124 pattern.
126 . There should be a performance improvement when using the heap instead of the
127 stack for recursion.
129 . pcregrep can now be linked with libedit as an alternative to libreadline.
131 . pcregrep now has a --file-list option where the list of files to scan is
132 given as a file.
134 . pcregrep now recognizes binary files and there are related options.
136 . The Unicode tables have been updated to 6.1.0.
138 As always, the full list of changes is in the ChangeLog file.
141 Release 8.30 04-February-2012
142 -----------------------------
144 Release 8.30 introduces a major new feature: support for 16-bit character
145 strings, compiled as a separate library. There are a few changes to the
146 8-bit library, in addition to some bug fixes.
148 . The pcre_info() function, which has been obsolete for over 10 years, has
149 been removed.
151 . When a compiled pattern was saved to a file and later reloaded on a host
152 with different endianness, PCRE used automatically to swap the bytes in some
153 of the data fields. With the advent of the 16-bit library, where more of this
154 swapping is needed, it is no longer done automatically. Instead, the bad
155 endianness is detected and a specific error is given. The user can then call
156 a new function called pcre_pattern_to_host_byte_order() (or an equivalent
157 16-bit function) to do the swap.
159 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
160 code points and are now faulted. (They are the so-called "surrogates"
161 that are reserved for coding high values in UTF-16.)
164 Release 8.21 12-Dec-2011
165 ------------------------
167 This is almost entirely a bug-fix release. The only new feature is the ability
168 to obtain the size of the memory used by the JIT compiler.
171 Release 8.20 21-Oct-2011
172 ------------------------
174 The main change in this release is the inclusion of Zoltan Herczeg's
175 just-in-time compiler support, which can be accessed by building PCRE with
176 --enable-jit. Large performance benefits can be had in many situations. 8.20
177 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
178 a number of infelicities and differences from Perl.
181 Release 8.13 16-Aug-2011
182 ------------------------
184 This is mainly a bug-fix release. There has been a lot of internal refactoring.
185 The Unicode tables have been updated. The only new feature in the library is
186 the passing of *MARK information to callouts. Some additions have been made to
187 pcretest to make testing easier and more comprehensive. There is a new option
188 for pcregrep to adjust its internal buffer size.
191 Release 8.12 15-Jan-2011
192 ------------------------
194 This release fixes some bugs in pcregrep, one of which caused the tests to fail
195 on 64-bit big-endian systems. There are no changes to the code of the library.
198 Release 8.11 10-Dec-2010
199 ------------------------
201 A number of bugs in the library and in pcregrep have been fixed. As always, see
202 ChangeLog for details. The following are the non-bug-fix changes:
204 . Added --match-limit and --recursion-limit to pcregrep.
206 . Added an optional parentheses number to the -o and --only-matching options
207 of pcregrep.
209 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
210 \B.
212 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
213 bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
215 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
216 START_OPTIMIZE option, which is now allowed at compile time
219 Release 8.10 25-Jun-2010
220 ------------------------
222 There are two major additions: support for (*MARK) and friends, and the option
223 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
224 opposites) so that they make use of Unicode properties. There are also a number
225 of lesser new features, and several bugs have been fixed. A new option,
226 --line-buffered, has been added to pcregrep, for use when it is connected to
227 pipes.
230 Release 8.02 19-Mar-2010
231 ------------------------
233 Another bug-fix release.
236 Release 8.01 19-Jan-2010
237 ------------------------
239 This is a bug-fix release. Several bugs in the code itself and some bugs and
240 infelicities in the build system have been fixed.
243 Release 8.00 19-Oct-09
244 ----------------------
246 Bugs have been fixed in the library and in pcregrep. There are also some
247 enhancements. Restrictions on patterns used for partial matching have been
248 removed, extra information is given for partial matches, the partial matching
249 process has been improved, and an option to make a partial match override a
250 full match is available. The "study" process has been enhanced by finding a
251 lower bound matching length. Groups with duplicate numbers may now have
252 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
253 different names. The documentation has been revised to reflect these changes.
254 The version number has been expanded to 3 digits as it is clear that the rate
255 of change is not slowing down.
258 Release 7.9 11-Apr-09
259 ---------------------
261 Mostly bugfixes and tidies with just a couple of minor functional additions.
264 Release 7.8 05-Sep-08
265 ---------------------
267 More bug fixes, plus a performance improvement in Unicode character property
268 lookup.
271 Release 7.7 07-May-08
272 ---------------------
274 This is once again mainly a bug-fix release, but there are a couple of new
275 features.
278 Release 7.6 28-Jan-08
279 ---------------------
281 The main reason for having this release so soon after 7.5 is because it fixes a
282 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
283 addition, the CMake configuration files have been brought up to date.
286 Release 7.5 10-Jan-08
287 ---------------------
289 This is mainly a bug-fix release. However the ability to link pcregrep with
290 libz or libbz2 and the ability to link pcretest with libreadline have been
291 added. Also the --line-offsets and --file-offsets options were added to
292 pcregrep.
295 Release 7.4 21-Sep-07
296 ---------------------
298 The only change of specification is the addition of options to control whether
299 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
300 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
301 relocations needed in a shared library. There have also been some documentation
302 updates, in particular, some more information about using CMake to build PCRE
303 has been added to the NON-UNIX-USE file.
306 Release 7.3 28-Aug-07
307 ---------------------
309 Most changes are bug fixes. Some that are not:
311 1. There is some support for Perl 5.10's experimental "backtracking control
312 verbs" such as (*PRUNE).
314 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
315 restrictive in the strings it accepts.
317 3. Checking for potential integer overflow has been made more dynamic, and as a
318 consequence there is no longer a hard limit on the size of a subpattern that
319 has a limited repeat count.
321 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
322 no longer advance by two characters instead of one when an unanchored match
323 fails at CRLF if there are explicit CR or LF matches within the pattern.
324 This gets rid of some anomalous effects that previously occurred.
326 5. Some PCRE-specific settings for varying the newline options at the start of
327 a pattern have been added.
330 Release 7.2 19-Jun-07
331 ---------------------
333 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
334 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
335 and \V).
337 Correction to the notes for 7.1: the note about shared libraries for Windows is
338 wrong. Previously, three libraries were built, but each could function
339 independently. For example, the pcreposix library also included all the
340 functions from the basic pcre library. The change is that the three libraries
341 are no longer independent. They are like the Unix libraries. To use the
342 pcreposix functions, for example, you need to link with both the pcreposix and
343 the basic pcre library.
345 Some more features from Perl 5.10 have been added:
347 (?-n) and (?+n) relative references for recursion and subroutines.
349 (?(-n) and (?(+n) relative references as conditions.
351 \k{name} and \g{name} are synonyms for \k<name>.
353 \K to reset the start of the matched string; for example, (foo)\Kbar
354 matches bar preceded by foo, but only sets bar as the matched string.
356 (?| introduces a group where the capturing parentheses in each alternative
357 start from the same number; for example, (?|(abc)|(xyz)) sets capturing
358 parentheses number 1 in both cases.
360 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
363 Release 7.1 24-Apr-07
364 ---------------------
366 There is only one new feature in this release: a linebreak setting of
367 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
368 recognizes only CRLF, CR, and LF as linebreaks.
370 A few bugs are fixed (see ChangeLog for details), but the major change is a
371 complete re-implementation of the build system. This now has full Autotools
372 support and so is now "standard" in some sense. It should help with compiling
373 PCRE in a wide variety of environments.
375 NOTE: when building shared libraries for Windows, three dlls are now built,
376 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
377 included in a single dll.
379 Another important change is that the dftables auxiliary program is no longer
380 compiled and run at "make" time by default. Instead, a default set of character
381 tables (assuming ASCII coding) is used. If you want to use dftables to generate
382 the character tables as previously, add --enable-rebuild-chartables to the
383 "configure" command. You must do this if you are compiling PCRE to run on a
384 system that uses EBCDIC code.
386 There is a discussion about character tables in the README file. The default is
387 not to use dftables so that that there is no problem when cross-compiling.
390 Release 7.0 19-Dec-06
391 ---------------------
393 This release has a new major number because there have been some internal
394 upheavals to facilitate the addition of new optimizations and other facilities,
395 and to make subsequent maintenance and extension easier. Compilation is likely
396 to be a bit slower, but there should be no major effect on runtime performance.
397 Previously compiled patterns are NOT upwards compatible with this release. If
398 you have saved compiled patterns from a previous release, you will have to
399 re-compile them. Important changes that are visible to users are:
401 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
402 some more scripts.
404 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
405 sequence as a newline.
407 3. The \R escape matches a single Unicode newline sequence as a single unit.
409 4. New features that will appear in Perl 5.10 are now in PCRE. These include
410 alternative Perl syntax for named parentheses, and Perl syntax for
411 recursion.
413 5. The C++ wrapper interface has been extended by the addition of a
414 QuoteMeta function and the ability to allow copy construction and
415 assignment.
417 For a complete list of changes, see the ChangeLog file.
420 Release 6.7 04-Jul-06
421 ---------------------
423 The main additions to this release are the ability to use the same name for
424 multiple sets of parentheses, and support for CRLF line endings in both the
425 library and pcregrep (and in pcretest for testing).
427 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
428 significantly reduced for certain subject strings.
431 Release 6.5 01-Feb-06
432 ---------------------
434 Important changes in this release:
436 1. A number of new features have been added to pcregrep.
438 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
439 supported properties have been extended with script names such as "Arabic",
440 and the derived properties "Any" and "L&". This has necessitated a change to
441 the interal format of compiled patterns. Any saved compiled patterns that
442 use \p or \P must be recompiled.
444 3. The specification of recursion in patterns has been changed so that all
445 recursive subpatterns are automatically treated as atomic groups. Thus, for
446 example, (?R) is treated as if it were (?>(?R)). This is necessary because
447 otherwise there are situations where recursion does not work.
449 See the ChangeLog for a complete list of changes, which include a number of bug
450 fixes and tidies.
453 Release 6.0 07-Jun-05
454 ---------------------
456 The release number has been increased to 6.0 because of the addition of several
457 major new pieces of functionality.
459 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
460 algorithm, has been added. This has a number of advantages for certain cases,
461 though it does run more slowly, and lacks the ability to capture substrings. On
462 the other hand, it does find all matches, not just the first, and it works
463 better for partial matching. The pcrematching man page discusses the
464 differences.
466 The pcretest program has been enhanced so that it can make use of the new
467 pcre_dfa_exec() matching function and the extra features it provides.
469 The distribution now includes a C++ wrapper library. This is built
470 automatically if a C++ compiler is found. The pcrecpp man page discusses this
471 interface.
473 The code itself has been re-organized into many more files, one for each
474 function, so it no longer requires everything to be linked in when static
475 linkage is used. As a consequence, some internal functions have had to have
476 their names exposed. These functions all have names starting with _pcre_. They
477 are undocumented, and are not intended for use by outside callers.
479 The pcregrep program has been enhanced with new functionality such as
480 multiline-matching and options for output more matching context. See the
481 ChangeLog for a complete list of changes to the library and the utility
482 programs.
485 Release 5.0 13-Sep-04
486 ---------------------
488 The licence under which PCRE is released has been changed to the more
489 conventional "BSD" licence.
491 In the code, some bugs have been fixed, and there are also some major changes
492 in this release (which is why I've increased the number to 5.0). Some changes
493 are internal rearrangements, and some provide a number of new facilities. The
494 new features are:
496 1. There's an "automatic callout" feature that inserts callouts before every
497 item in the regex, and there's a new callout field that gives the position
498 in the pattern - useful for debugging and tracing.
500 2. The extra_data structure can now be used to pass in a set of character
501 tables at exec time. This is useful if compiled regex are saved and re-used
502 at a later time when the tables may not be at the same address. If the
503 default internal tables are used, the pointer saved with the compiled
504 pattern is now set to NULL, which means that you don't need to do anything
505 special unless you are using custom tables.
507 3. It is possible, with some restrictions on the content of the regex, to
508 request "partial" matching. A special return code is given if all of the
509 subject string matched part of the regex. This could be useful for testing
510 an input field as it is being typed.
512 4. There is now some optional support for Unicode character properties, which
513 means that the patterns items such as \p{Lu} and \X can now be used. Only
514 the general category properties are supported. If PCRE is compiled with this
515 support, an additional 90K data structure is include, which increases the
516 size of the library dramatically.
518 5. There is support for saving compiled patterns and re-using them later.
520 6. There is support for running regular expressions that were compiled on a
521 different host with the opposite endianness.
523 7. The pcretest program has been extended to accommodate the new features.
525 The main internal rearrangement is that sequences of literal characters are no
526 longer handled as strings. Instead, each character is handled on its own. This
527 makes some UTF-8 handling easier, and makes the support of partial matching
528 possible. Compiled patterns containing long literal strings will be larger as a
529 result of this change; I hope that performance will not be much affected.
532 Release 4.5 01-Dec-03
533 ---------------------
535 Again mainly a bug-fix and tidying release, with only a couple of new features:
537 1. It's possible now to compile PCRE so that it does not use recursive
538 function calls when matching. Instead it gets memory from the heap. This slows
539 things down, but may be necessary on systems with limited stacks.
541 2. UTF-8 string checking has been tightened to reject overlong sequences and to
542 check that a starting offset points to the start of a character. Failure of the
543 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
545 3. PCRE can now be compiled for systems that use EBCDIC code.
548 Release 4.4 21-Aug-03
549 ---------------------
551 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
552 checks UTF-8 strings for validity by default. There is an option to suppress
553 this, just in case anybody wants that teeny extra bit of performance.
556 Releases 4.1 - 4.3
557 ------------------
559 Sorry, I forgot about updating the NEWS file for these releases. Please take a
560 look at ChangeLog.
563 Release 4.0 17-Feb-03
564 ---------------------
566 There have been a lot of changes for the 4.0 release, adding additional
567 functionality and mending bugs. Below is a list of the highlights of the new
568 functionality. For full details of these features, please consult the
569 documentation. For a complete list of changes, see the ChangeLog file.
571 1. Support for Perl's \Q...\E escapes.
573 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
574 package. They provide some syntactic sugar for simple cases of "atomic
575 grouping".
577 3. Support for the \G assertion. It is true when the current matching position
578 is at the start point of the match.
580 4. A new feature that provides some of the functionality that Perl provides
581 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
582 is for the caller to provide an optional function, by setting pcre_callout to
583 its entry point. To get the function called, the regex must include (?C) at
584 appropriate points.
586 5. Support for recursive calls to individual subpatterns. This makes it really
587 easy to get totally confused.
589 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
590 name a group.
592 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
593 option for pcregrep to make it operate in UTF-8 mode.
595 8. The single man page has been split into a number of separate man pages.
596 These also give rise to individual HTML pages which are put in a separate
597 directory. There is an index.html page that lists them all. Some hyperlinking
598 between the pages has been installed.
601 Release 3.5 15-Aug-01
602 ---------------------
604 1. The configuring system has been upgraded to use later versions of autoconf
605 and libtool. By default it builds both a shared and a static library if the OS
606 supports it. You can use --disable-shared or --disable-static on the configure
607 command if you want only one of them.
609 2. The pcretest utility is now installed along with pcregrep because it is
610 useful for users (to test regexs) and by doing this, it automatically gets
611 relinked by libtool. The documentation has been turned into a man page, so
612 there are now .1, .txt, and .html versions in /doc.
614 3. Upgrades to pcregrep:
615 (i) Added long-form option names like gnu grep.
616 (ii) Added --help to list all options with an explanatory phrase.
617 (iii) Added -r, --recursive to recurse into sub-directories.
618 (iv) Added -f, --file to read patterns from a file.
620 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
621 script, to force use of CR or LF instead of \n in the source. On non-Unix
622 systems, the value can be set in config.h.
624 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
625 absolute limit. Changed the text of the error message to make this clear, and
626 likewise updated the man page.
628 6. The limit of 99 on the number of capturing subpatterns has been removed.
629 The new limit is 65535, which I hope will not be a "real" limit.
632 Release 3.3 01-Aug-00
633 ---------------------
635 There is some support for UTF-8 character strings. This is incomplete and
636 experimental. The documentation describes what is and what is not implemented.
637 Otherwise, this is just a bug-fixing release.
640 Release 3.0 01-Feb-00
641 ---------------------
643 1. A "configure" script is now used to configure PCRE for Unix systems. It
644 builds a Makefile, a config.h file, and the pcre-config script.
646 2. PCRE is built as a shared library by default.
648 3. There is support for POSIX classes such as [:alpha:].
650 5. There is an experimental recursion feature.
652 ----------------------------------------------------------------------------
655 Please note that there has been a change in the API such that a larger
656 ovector is required at matching time, to provide some additional workspace.
657 The new man page has details. This change was necessary in order to support
658 some of the new functionality in Perl 5.005.
662 Another (I hope this is the last!) change has been made to the API for the
663 pcre_compile() function. An additional argument has been added to make it
664 possible to pass over a pointer to character tables built in the current
665 locale by pcre_maketables(). To use the default tables, this new argument
666 should be passed as NULL.
670 Yet another (and again I hope this really is the last) change has been made
671 to the API for the pcre_exec() function. An additional argument has been
672 added to make it possible to start the match other than at the start of the
673 subject string. This is important if there are lookbehinds. The new man
674 page has the details, but you just want to convert existing programs, all
675 you need to do is to stick in a new fifth argument to pcre_exec(), with a
676 value of zero. For example, change
678 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
679 to
680 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
682 ****


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