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Sat Jan 15 11:31:39 2011 UTC (3 years, 11 months ago) by ph10
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Tidies for Release 8.12

1 nigel 41 News about PCRE releases
2     ------------------------
3    
4 ph10 588 Release 8.12 15-Jan-2011
5     ------------------------
6    
7 ph10 589 This release fixes some bugs in pcregrep, one of which caused the tests to fail
8 ph10 588 on 64-bit big-endian systems. There are no changes to the code of the library.
9    
10    
11 ph10 581 Release 8.11 10-Dec-2010
12 ph10 579 ------------------------
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 ph10 548 Release 8.10 25-Jun-2010
33 ph10 535 ------------------------
34    
35 ph10 545 There are two major additions: support for (*MARK) and friends, and the option
36 ph10 535 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 ph10 508 Release 8.02 19-Mar-2010
44 ph10 507 ------------------------
45    
46     Another bug-fix release.
47    
48    
49 ph10 489 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 ph10 469 Release 8.00 19-Oct-09
57 ph10 461 ----------------------
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 ph10 415 Release 7.9 11-Apr-09
72 ph10 411 ---------------------
73 ph10 345
74 ph10 411 Mostly bugfixes and tidies with just a couple of minor functional additions.
75    
76    
77 ph10 374 Release 7.8 05-Sep-08
78 ph10 371 ---------------------
79    
80     More bug fixes, plus a performance improvement in Unicode character property
81     lookup.
82    
83    
84 ph10 347 Release 7.7 07-May-08
85 ph10 345 ---------------------
86    
87     This is once again mainly a bug-fix release, but there are a couple of new
88     features.
89    
90    
91 ph10 319 Release 7.6 28-Jan-08
92 ph10 309 ---------------------
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 ph10 298 Release 7.5 10-Jan-08
100 ph10 289 ---------------------
101 ph10 122
102 ph10 289 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 ph10 260 Release 7.4 21-Sep-07
109 ph10 242 ---------------------
110    
111 ph10 243 The only change of specification is the addition of options to control whether
112 ph10 242 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
113 ph10 243 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
114 ph10 261 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 ph10 242
118    
119 ph10 228 Release 7.3 28-Aug-07
120 ph10 212 ---------------------
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 ph10 227
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 ph10 226 This gets rid of some anomalous effects that previously occurred.
138 ph10 212
139 ph10 227 5. Some PCRE-specific settings for varying the newline options at the start of
140     a pattern have been added.
141 ph10 212
142 ph10 227
143 ph10 184 Release 7.2 19-Jun-07
144 ph10 157 ---------------------
145    
146 ph10 172 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
147 ph10 181 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
148     and \V).
149 ph10 168
150 ph10 159 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 ph10 157 the basic pcre library.
157    
158 ph10 166 Some more features from Perl 5.10 have been added:
159 ph10 157
160 ph10 166 (?-n) and (?+n) relative references for recursion and subroutines.
161 ph10 172
162     (?(-n) and (?(+n) relative references as conditions.
163 ph10 182
164 ph10 181 \k{name} and \g{name} are synonyms for \k<name>.
165 ph10 172
166 ph10 168 \K to reset the start of the matched string; for example, (foo)\Kbar
167 ph10 175 matches bar preceded by foo, but only sets bar as the matched string.
168 ph10 182
169     (?| introduces a group where the capturing parentheses in each alternative
170     start from the same number; for example, (?|(abc)|(xyz)) sets capturing
171 ph10 175 parentheses number 1 in both cases.
172 ph10 166
173 ph10 182 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
174 ph10 166
175 ph10 182
176 ph10 155 Release 7.1 24-Apr-07
177 nigel 93 ---------------------
178    
179 ph10 155 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 ph10 122
183 ph10 155 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 ph10 146 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 ph10 128 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 ph10 122
199 ph10 128 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 ph10 122 Release 7.0 19-Dec-06
204     ---------------------
205    
206 nigel 93 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 nigel 91 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 nigel 87 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 nigel 77 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 nigel 75 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 nigel 73 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 nigel 71 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 nigel 63 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 nigel 53 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 nigel 49 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 nigel 43 Release 3.0 01-Feb-00
454     ---------------------
455 nigel 41
456 nigel 43 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 nigel 41 ----------------------------------------------------------------------------
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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