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1.1 misho 1: News about PCRE releases
2: ------------------------
3:
4: Release 8.12 15-Jan-2011
5: ------------------------
6:
7: This release fixes some bugs in pcregrep, one of which caused the tests to fail
8: on 64-bit big-endian systems. There are no changes to the code of the library.
9:
10:
11: Release 8.11 10-Dec-2010
12: ------------------------
13:
14: A number of bugs in the library and in pcregrep have been fixed. As always, see
15: ChangeLog for details. The following are the non-bug-fix changes:
16:
17: . Added --match-limit and --recursion-limit to pcregrep.
18:
19: . Added an optional parentheses number to the -o and --only-matching options
20: of pcregrep.
21:
22: . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
23: \B.
24:
25: . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
26: bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
27:
28: . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
29: START_OPTIMIZE option, which is now allowed at compile time
30:
31:
32: Release 8.10 25-Jun-2010
33: ------------------------
34:
35: There are two major additions: support for (*MARK) and friends, and the option
36: PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
37: opposites) so that they make use of Unicode properties. There are also a number
38: of lesser new features, and several bugs have been fixed. A new option,
39: --line-buffered, has been added to pcregrep, for use when it is connected to
40: pipes.
41:
42:
43: Release 8.02 19-Mar-2010
44: ------------------------
45:
46: Another bug-fix release.
47:
48:
49: Release 8.01 19-Jan-2010
50: ------------------------
51:
52: This is a bug-fix release. Several bugs in the code itself and some bugs and
53: infelicities in the build system have been fixed.
54:
55:
56: Release 8.00 19-Oct-09
57: ----------------------
58:
59: Bugs have been fixed in the library and in pcregrep. There are also some
60: enhancements. Restrictions on patterns used for partial matching have been
61: removed, extra information is given for partial matches, the partial matching
62: process has been improved, and an option to make a partial match override a
63: full match is available. The "study" process has been enhanced by finding a
64: lower bound matching length. Groups with duplicate numbers may now have
65: duplicated names without the use of PCRE_DUPNAMES. However, they may not have
66: different names. The documentation has been revised to reflect these changes.
67: The version number has been expanded to 3 digits as it is clear that the rate
68: of change is not slowing down.
69:
70:
71: Release 7.9 11-Apr-09
72: ---------------------
73:
74: Mostly bugfixes and tidies with just a couple of minor functional additions.
75:
76:
77: Release 7.8 05-Sep-08
78: ---------------------
79:
80: More bug fixes, plus a performance improvement in Unicode character property
81: lookup.
82:
83:
84: Release 7.7 07-May-08
85: ---------------------
86:
87: This is once again mainly a bug-fix release, but there are a couple of new
88: features.
89:
90:
91: Release 7.6 28-Jan-08
92: ---------------------
93:
94: The main reason for having this release so soon after 7.5 is because it fixes a
95: potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
96: addition, the CMake configuration files have been brought up to date.
97:
98:
99: Release 7.5 10-Jan-08
100: ---------------------
101:
102: This is mainly a bug-fix release. However the ability to link pcregrep with
103: libz or libbz2 and the ability to link pcretest with libreadline have been
104: added. Also the --line-offsets and --file-offsets options were added to
105: pcregrep.
106:
107:
108: Release 7.4 21-Sep-07
109: ---------------------
110:
111: The only change of specification is the addition of options to control whether
112: \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
113: Otherwise, the changes are bug fixes and a refactoring to reduce the number of
114: relocations needed in a shared library. There have also been some documentation
115: updates, in particular, some more information about using CMake to build PCRE
116: has been added to the NON-UNIX-USE file.
117:
118:
119: Release 7.3 28-Aug-07
120: ---------------------
121:
122: Most changes are bug fixes. Some that are not:
123:
124: 1. There is some support for Perl 5.10's experimental "backtracking control
125: verbs" such as (*PRUNE).
126:
127: 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
128: restrictive in the strings it accepts.
129:
130: 3. Checking for potential integer overflow has been made more dynamic, and as a
131: consequence there is no longer a hard limit on the size of a subpattern that
132: has a limited repeat count.
133:
134: 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
135: no longer advance by two characters instead of one when an unanchored match
136: fails at CRLF if there are explicit CR or LF matches within the pattern.
137: This gets rid of some anomalous effects that previously occurred.
138:
139: 5. Some PCRE-specific settings for varying the newline options at the start of
140: a pattern have been added.
141:
142:
143: Release 7.2 19-Jun-07
144: ---------------------
145:
146: WARNING: saved patterns that were compiled by earlier versions of PCRE must be
147: recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
148: and \V).
149:
150: Correction to the notes for 7.1: the note about shared libraries for Windows is
151: wrong. Previously, three libraries were built, but each could function
152: independently. For example, the pcreposix library also included all the
153: functions from the basic pcre library. The change is that the three libraries
154: are no longer independent. They are like the Unix libraries. To use the
155: pcreposix functions, for example, you need to link with both the pcreposix and
156: the basic pcre library.
157:
158: Some more features from Perl 5.10 have been added:
159:
160: (?-n) and (?+n) relative references for recursion and subroutines.
161:
162: (?(-n) and (?(+n) relative references as conditions.
163:
164: \k{name} and \g{name} are synonyms for \k<name>.
165:
166: \K to reset the start of the matched string; for example, (foo)\Kbar
167: matches bar preceded by foo, but only sets bar as the matched string.
168:
169: (?| introduces a group where the capturing parentheses in each alternative
170: start from the same number; for example, (?|(abc)|(xyz)) sets capturing
171: parentheses number 1 in both cases.
172:
173: \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
174:
175:
176: Release 7.1 24-Apr-07
177: ---------------------
178:
179: There is only one new feature in this release: a linebreak setting of
180: PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
181: recognizes only CRLF, CR, and LF as linebreaks.
182:
183: A few bugs are fixed (see ChangeLog for details), but the major change is a
184: complete re-implementation of the build system. This now has full Autotools
185: support and so is now "standard" in some sense. It should help with compiling
186: PCRE in a wide variety of environments.
187:
188: NOTE: when building shared libraries for Windows, three dlls are now built,
189: called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
190: included in a single dll.
191:
192: Another important change is that the dftables auxiliary program is no longer
193: compiled and run at "make" time by default. Instead, a default set of character
194: tables (assuming ASCII coding) is used. If you want to use dftables to generate
195: the character tables as previously, add --enable-rebuild-chartables to the
196: "configure" command. You must do this if you are compiling PCRE to run on a
197: system that uses EBCDIC code.
198:
199: There is a discussion about character tables in the README file. The default is
200: not to use dftables so that that there is no problem when cross-compiling.
201:
202:
203: Release 7.0 19-Dec-06
204: ---------------------
205:
206: This release has a new major number because there have been some internal
207: upheavals to facilitate the addition of new optimizations and other facilities,
208: and to make subsequent maintenance and extension easier. Compilation is likely
209: to be a bit slower, but there should be no major effect on runtime performance.
210: Previously compiled patterns are NOT upwards compatible with this release. If
211: you have saved compiled patterns from a previous release, you will have to
212: re-compile them. Important changes that are visible to users are:
213:
214: 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
215: some more scripts.
216:
217: 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
218: sequence as a newline.
219:
220: 3. The \R escape matches a single Unicode newline sequence as a single unit.
221:
222: 4. New features that will appear in Perl 5.10 are now in PCRE. These include
223: alternative Perl syntax for named parentheses, and Perl syntax for
224: recursion.
225:
226: 5. The C++ wrapper interface has been extended by the addition of a
227: QuoteMeta function and the ability to allow copy construction and
228: assignment.
229:
230: For a complete list of changes, see the ChangeLog file.
231:
232:
233: Release 6.7 04-Jul-06
234: ---------------------
235:
236: The main additions to this release are the ability to use the same name for
237: multiple sets of parentheses, and support for CRLF line endings in both the
238: library and pcregrep (and in pcretest for testing).
239:
240: Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
241: significantly reduced for certain subject strings.
242:
243:
244: Release 6.5 01-Feb-06
245: ---------------------
246:
247: Important changes in this release:
248:
249: 1. A number of new features have been added to pcregrep.
250:
251: 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
252: supported properties have been extended with script names such as "Arabic",
253: and the derived properties "Any" and "L&". This has necessitated a change to
254: the interal format of compiled patterns. Any saved compiled patterns that
255: use \p or \P must be recompiled.
256:
257: 3. The specification of recursion in patterns has been changed so that all
258: recursive subpatterns are automatically treated as atomic groups. Thus, for
259: example, (?R) is treated as if it were (?>(?R)). This is necessary because
260: otherwise there are situations where recursion does not work.
261:
262: See the ChangeLog for a complete list of changes, which include a number of bug
263: fixes and tidies.
264:
265:
266: Release 6.0 07-Jun-05
267: ---------------------
268:
269: The release number has been increased to 6.0 because of the addition of several
270: major new pieces of functionality.
271:
272: A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
273: algorithm, has been added. This has a number of advantages for certain cases,
274: though it does run more slowly, and lacks the ability to capture substrings. On
275: the other hand, it does find all matches, not just the first, and it works
276: better for partial matching. The pcrematching man page discusses the
277: differences.
278:
279: The pcretest program has been enhanced so that it can make use of the new
280: pcre_dfa_exec() matching function and the extra features it provides.
281:
282: The distribution now includes a C++ wrapper library. This is built
283: automatically if a C++ compiler is found. The pcrecpp man page discusses this
284: interface.
285:
286: The code itself has been re-organized into many more files, one for each
287: function, so it no longer requires everything to be linked in when static
288: linkage is used. As a consequence, some internal functions have had to have
289: their names exposed. These functions all have names starting with _pcre_. They
290: are undocumented, and are not intended for use by outside callers.
291:
292: The pcregrep program has been enhanced with new functionality such as
293: multiline-matching and options for output more matching context. See the
294: ChangeLog for a complete list of changes to the library and the utility
295: programs.
296:
297:
298: Release 5.0 13-Sep-04
299: ---------------------
300:
301: The licence under which PCRE is released has been changed to the more
302: conventional "BSD" licence.
303:
304: In the code, some bugs have been fixed, and there are also some major changes
305: in this release (which is why I've increased the number to 5.0). Some changes
306: are internal rearrangements, and some provide a number of new facilities. The
307: new features are:
308:
309: 1. There's an "automatic callout" feature that inserts callouts before every
310: item in the regex, and there's a new callout field that gives the position
311: in the pattern - useful for debugging and tracing.
312:
313: 2. The extra_data structure can now be used to pass in a set of character
314: tables at exec time. This is useful if compiled regex are saved and re-used
315: at a later time when the tables may not be at the same address. If the
316: default internal tables are used, the pointer saved with the compiled
317: pattern is now set to NULL, which means that you don't need to do anything
318: special unless you are using custom tables.
319:
320: 3. It is possible, with some restrictions on the content of the regex, to
321: request "partial" matching. A special return code is given if all of the
322: subject string matched part of the regex. This could be useful for testing
323: an input field as it is being typed.
324:
325: 4. There is now some optional support for Unicode character properties, which
326: means that the patterns items such as \p{Lu} and \X can now be used. Only
327: the general category properties are supported. If PCRE is compiled with this
328: support, an additional 90K data structure is include, which increases the
329: size of the library dramatically.
330:
331: 5. There is support for saving compiled patterns and re-using them later.
332:
333: 6. There is support for running regular expressions that were compiled on a
334: different host with the opposite endianness.
335:
336: 7. The pcretest program has been extended to accommodate the new features.
337:
338: The main internal rearrangement is that sequences of literal characters are no
339: longer handled as strings. Instead, each character is handled on its own. This
340: makes some UTF-8 handling easier, and makes the support of partial matching
341: possible. Compiled patterns containing long literal strings will be larger as a
342: result of this change; I hope that performance will not be much affected.
343:
344:
345: Release 4.5 01-Dec-03
346: ---------------------
347:
348: Again mainly a bug-fix and tidying release, with only a couple of new features:
349:
350: 1. It's possible now to compile PCRE so that it does not use recursive
351: function calls when matching. Instead it gets memory from the heap. This slows
352: things down, but may be necessary on systems with limited stacks.
353:
354: 2. UTF-8 string checking has been tightened to reject overlong sequences and to
355: check that a starting offset points to the start of a character. Failure of the
356: latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
357:
358: 3. PCRE can now be compiled for systems that use EBCDIC code.
359:
360:
361: Release 4.4 21-Aug-03
362: ---------------------
363:
364: This is mainly a bug-fix and tidying release. The only new feature is that PCRE
365: checks UTF-8 strings for validity by default. There is an option to suppress
366: this, just in case anybody wants that teeny extra bit of performance.
367:
368:
369: Releases 4.1 - 4.3
370: ------------------
371:
372: Sorry, I forgot about updating the NEWS file for these releases. Please take a
373: look at ChangeLog.
374:
375:
376: Release 4.0 17-Feb-03
377: ---------------------
378:
379: There have been a lot of changes for the 4.0 release, adding additional
380: functionality and mending bugs. Below is a list of the highlights of the new
381: functionality. For full details of these features, please consult the
382: documentation. For a complete list of changes, see the ChangeLog file.
383:
384: 1. Support for Perl's \Q...\E escapes.
385:
386: 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
387: package. They provide some syntactic sugar for simple cases of "atomic
388: grouping".
389:
390: 3. Support for the \G assertion. It is true when the current matching position
391: is at the start point of the match.
392:
393: 4. A new feature that provides some of the functionality that Perl provides
394: with (?{...}). The facility is termed a "callout". The way it is done in PCRE
395: is for the caller to provide an optional function, by setting pcre_callout to
396: its entry point. To get the function called, the regex must include (?C) at
397: appropriate points.
398:
399: 5. Support for recursive calls to individual subpatterns. This makes it really
400: easy to get totally confused.
401:
402: 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
403: name a group.
404:
405: 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
406: option for pcregrep to make it operate in UTF-8 mode.
407:
408: 8. The single man page has been split into a number of separate man pages.
409: These also give rise to individual HTML pages which are put in a separate
410: directory. There is an index.html page that lists them all. Some hyperlinking
411: between the pages has been installed.
412:
413:
414: Release 3.5 15-Aug-01
415: ---------------------
416:
417: 1. The configuring system has been upgraded to use later versions of autoconf
418: and libtool. By default it builds both a shared and a static library if the OS
419: supports it. You can use --disable-shared or --disable-static on the configure
420: command if you want only one of them.
421:
422: 2. The pcretest utility is now installed along with pcregrep because it is
423: useful for users (to test regexs) and by doing this, it automatically gets
424: relinked by libtool. The documentation has been turned into a man page, so
425: there are now .1, .txt, and .html versions in /doc.
426:
427: 3. Upgrades to pcregrep:
428: (i) Added long-form option names like gnu grep.
429: (ii) Added --help to list all options with an explanatory phrase.
430: (iii) Added -r, --recursive to recurse into sub-directories.
431: (iv) Added -f, --file to read patterns from a file.
432:
433: 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
434: script, to force use of CR or LF instead of \n in the source. On non-Unix
435: systems, the value can be set in config.h.
436:
437: 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
438: absolute limit. Changed the text of the error message to make this clear, and
439: likewise updated the man page.
440:
441: 6. The limit of 99 on the number of capturing subpatterns has been removed.
442: The new limit is 65535, which I hope will not be a "real" limit.
443:
444:
445: Release 3.3 01-Aug-00
446: ---------------------
447:
448: There is some support for UTF-8 character strings. This is incomplete and
449: experimental. The documentation describes what is and what is not implemented.
450: Otherwise, this is just a bug-fixing release.
451:
452:
453: Release 3.0 01-Feb-00
454: ---------------------
455:
456: 1. A "configure" script is now used to configure PCRE for Unix systems. It
457: builds a Makefile, a config.h file, and the pcre-config script.
458:
459: 2. PCRE is built as a shared library by default.
460:
461: 3. There is support for POSIX classes such as [:alpha:].
462:
463: 5. There is an experimental recursion feature.
464:
465: ----------------------------------------------------------------------------
466: IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
467:
468: Please note that there has been a change in the API such that a larger
469: ovector is required at matching time, to provide some additional workspace.
470: The new man page has details. This change was necessary in order to support
471: some of the new functionality in Perl 5.005.
472:
473: IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
474:
475: Another (I hope this is the last!) change has been made to the API for the
476: pcre_compile() function. An additional argument has been added to make it
477: possible to pass over a pointer to character tables built in the current
478: locale by pcre_maketables(). To use the default tables, this new arguement
479: should be passed as NULL.
480:
481: IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
482:
483: Yet another (and again I hope this really is the last) change has been made
484: to the API for the pcre_exec() function. An additional argument has been
485: added to make it possible to start the match other than at the start of the
486: subject string. This is important if there are lookbehinds. The new man
487: page has the details, but you just want to convert existing programs, all
488: you need to do is to stick in a new fifth argument to pcre_exec(), with a
489: value of zero. For example, change
490:
491: pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
492: to
493: pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
494:
495: ****

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