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Revision 347 - (hide annotations) (download)
Wed May 7 16:38:04 2008 UTC (6 years, 7 months ago) by ph10
File size: 17087 byte(s)
Final updates for 7.7 release.

1 nigel 41 News about PCRE releases
2     ------------------------
3    
4 ph10 345
5 ph10 347 Release 7.7 07-May-08
6 ph10 345 ---------------------
7    
8     This is once again mainly a bug-fix release, but there are a couple of new
9     features.
10    
11    
12 ph10 319 Release 7.6 28-Jan-08
13 ph10 309 ---------------------
14    
15     The main reason for having this release so soon after 7.5 is because it fixes a
16     potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
17     addition, the CMake configuration files have been brought up to date.
18    
19    
20 ph10 298 Release 7.5 10-Jan-08
21 ph10 289 ---------------------
22 ph10 122
23 ph10 289 This is mainly a bug-fix release. However the ability to link pcregrep with
24     libz or libbz2 and the ability to link pcretest with libreadline have been
25     added. Also the --line-offsets and --file-offsets options were added to
26     pcregrep.
27    
28    
29 ph10 260 Release 7.4 21-Sep-07
30 ph10 242 ---------------------
31    
32 ph10 243 The only change of specification is the addition of options to control whether
33 ph10 242 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
34 ph10 243 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
35 ph10 261 relocations needed in a shared library. There have also been some documentation
36     updates, in particular, some more information about using CMake to build PCRE
37     has been added to the NON-UNIX-USE file.
38 ph10 242
39    
40 ph10 228 Release 7.3 28-Aug-07
41 ph10 212 ---------------------
42    
43     Most changes are bug fixes. Some that are not:
44    
45     1. There is some support for Perl 5.10's experimental "backtracking control
46     verbs" such as (*PRUNE).
47    
48     2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
49     restrictive in the strings it accepts.
50    
51     3. Checking for potential integer overflow has been made more dynamic, and as a
52     consequence there is no longer a hard limit on the size of a subpattern that
53     has a limited repeat count.
54 ph10 227
55     4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
56     no longer advance by two characters instead of one when an unanchored match
57     fails at CRLF if there are explicit CR or LF matches within the pattern.
58 ph10 226 This gets rid of some anomalous effects that previously occurred.
59 ph10 212
60 ph10 227 5. Some PCRE-specific settings for varying the newline options at the start of
61     a pattern have been added.
62 ph10 212
63 ph10 227
64 ph10 184 Release 7.2 19-Jun-07
65 ph10 157 ---------------------
66    
67 ph10 172 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
68 ph10 181 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
69     and \V).
70 ph10 168
71 ph10 159 Correction to the notes for 7.1: the note about shared libraries for Windows is
72     wrong. Previously, three libraries were built, but each could function
73     independently. For example, the pcreposix library also included all the
74     functions from the basic pcre library. The change is that the three libraries
75     are no longer independent. They are like the Unix libraries. To use the
76     pcreposix functions, for example, you need to link with both the pcreposix and
77 ph10 157 the basic pcre library.
78    
79 ph10 166 Some more features from Perl 5.10 have been added:
80 ph10 157
81 ph10 166 (?-n) and (?+n) relative references for recursion and subroutines.
82 ph10 172
83     (?(-n) and (?(+n) relative references as conditions.
84 ph10 182
85 ph10 181 \k{name} and \g{name} are synonyms for \k<name>.
86 ph10 172
87 ph10 168 \K to reset the start of the matched string; for example, (foo)\Kbar
88 ph10 175 matches bar preceded by foo, but only sets bar as the matched string.
89 ph10 182
90     (?| introduces a group where the capturing parentheses in each alternative
91     start from the same number; for example, (?|(abc)|(xyz)) sets capturing
92 ph10 175 parentheses number 1 in both cases.
93 ph10 166
94 ph10 182 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
95 ph10 166
96 ph10 182
97 ph10 155 Release 7.1 24-Apr-07
98 nigel 93 ---------------------
99    
100 ph10 155 There is only one new feature in this release: a linebreak setting of
101     PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
102     recognizes only CRLF, CR, and LF as linebreaks.
103 ph10 122
104 ph10 155 A few bugs are fixed (see ChangeLog for details), but the major change is a
105     complete re-implementation of the build system. This now has full Autotools
106     support and so is now "standard" in some sense. It should help with compiling
107     PCRE in a wide variety of environments.
108    
109 ph10 146 NOTE: when building shared libraries for Windows, three dlls are now built,
110     called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
111     included in a single dll.
112    
113     Another important change is that the dftables auxiliary program is no longer
114 ph10 128 compiled and run at "make" time by default. Instead, a default set of character
115     tables (assuming ASCII coding) is used. If you want to use dftables to generate
116     the character tables as previously, add --enable-rebuild-chartables to the
117     "configure" command. You must do this if you are compiling PCRE to run on a
118     system that uses EBCDIC code.
119 ph10 122
120 ph10 128 There is a discussion about character tables in the README file. The default is
121     not to use dftables so that that there is no problem when cross-compiling.
122    
123    
124 ph10 122 Release 7.0 19-Dec-06
125     ---------------------
126    
127 nigel 93 This release has a new major number because there have been some internal
128     upheavals to facilitate the addition of new optimizations and other facilities,
129     and to make subsequent maintenance and extension easier. Compilation is likely
130     to be a bit slower, but there should be no major effect on runtime performance.
131     Previously compiled patterns are NOT upwards compatible with this release. If
132     you have saved compiled patterns from a previous release, you will have to
133     re-compile them. Important changes that are visible to users are:
134    
135     1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
136     some more scripts.
137    
138     2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
139     sequence as a newline.
140    
141     3. The \R escape matches a single Unicode newline sequence as a single unit.
142    
143     4. New features that will appear in Perl 5.10 are now in PCRE. These include
144     alternative Perl syntax for named parentheses, and Perl syntax for
145     recursion.
146    
147     5. The C++ wrapper interface has been extended by the addition of a
148     QuoteMeta function and the ability to allow copy construction and
149     assignment.
150    
151     For a complete list of changes, see the ChangeLog file.
152    
153    
154 nigel 91 Release 6.7 04-Jul-06
155     ---------------------
156    
157     The main additions to this release are the ability to use the same name for
158     multiple sets of parentheses, and support for CRLF line endings in both the
159     library and pcregrep (and in pcretest for testing).
160    
161     Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
162     significantly reduced for certain subject strings.
163    
164    
165 nigel 87 Release 6.5 01-Feb-06
166     ---------------------
167    
168     Important changes in this release:
169    
170     1. A number of new features have been added to pcregrep.
171    
172     2. The Unicode property tables have been updated to Unicode 4.1.0, and the
173     supported properties have been extended with script names such as "Arabic",
174     and the derived properties "Any" and "L&". This has necessitated a change to
175     the interal format of compiled patterns. Any saved compiled patterns that
176     use \p or \P must be recompiled.
177    
178     3. The specification of recursion in patterns has been changed so that all
179     recursive subpatterns are automatically treated as atomic groups. Thus, for
180     example, (?R) is treated as if it were (?>(?R)). This is necessary because
181     otherwise there are situations where recursion does not work.
182    
183     See the ChangeLog for a complete list of changes, which include a number of bug
184     fixes and tidies.
185    
186    
187 nigel 77 Release 6.0 07-Jun-05
188     ---------------------
189    
190     The release number has been increased to 6.0 because of the addition of several
191     major new pieces of functionality.
192    
193     A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
194     algorithm, has been added. This has a number of advantages for certain cases,
195     though it does run more slowly, and lacks the ability to capture substrings. On
196     the other hand, it does find all matches, not just the first, and it works
197     better for partial matching. The pcrematching man page discusses the
198     differences.
199    
200     The pcretest program has been enhanced so that it can make use of the new
201     pcre_dfa_exec() matching function and the extra features it provides.
202    
203     The distribution now includes a C++ wrapper library. This is built
204     automatically if a C++ compiler is found. The pcrecpp man page discusses this
205     interface.
206    
207     The code itself has been re-organized into many more files, one for each
208     function, so it no longer requires everything to be linked in when static
209     linkage is used. As a consequence, some internal functions have had to have
210     their names exposed. These functions all have names starting with _pcre_. They
211     are undocumented, and are not intended for use by outside callers.
212    
213     The pcregrep program has been enhanced with new functionality such as
214     multiline-matching and options for output more matching context. See the
215     ChangeLog for a complete list of changes to the library and the utility
216     programs.
217    
218    
219 nigel 75 Release 5.0 13-Sep-04
220     ---------------------
221    
222     The licence under which PCRE is released has been changed to the more
223     conventional "BSD" licence.
224    
225     In the code, some bugs have been fixed, and there are also some major changes
226     in this release (which is why I've increased the number to 5.0). Some changes
227     are internal rearrangements, and some provide a number of new facilities. The
228     new features are:
229    
230     1. There's an "automatic callout" feature that inserts callouts before every
231     item in the regex, and there's a new callout field that gives the position
232     in the pattern - useful for debugging and tracing.
233    
234     2. The extra_data structure can now be used to pass in a set of character
235     tables at exec time. This is useful if compiled regex are saved and re-used
236     at a later time when the tables may not be at the same address. If the
237     default internal tables are used, the pointer saved with the compiled
238     pattern is now set to NULL, which means that you don't need to do anything
239     special unless you are using custom tables.
240    
241     3. It is possible, with some restrictions on the content of the regex, to
242     request "partial" matching. A special return code is given if all of the
243     subject string matched part of the regex. This could be useful for testing
244     an input field as it is being typed.
245    
246     4. There is now some optional support for Unicode character properties, which
247     means that the patterns items such as \p{Lu} and \X can now be used. Only
248     the general category properties are supported. If PCRE is compiled with this
249     support, an additional 90K data structure is include, which increases the
250     size of the library dramatically.
251    
252     5. There is support for saving compiled patterns and re-using them later.
253    
254     6. There is support for running regular expressions that were compiled on a
255     different host with the opposite endianness.
256    
257     7. The pcretest program has been extended to accommodate the new features.
258    
259     The main internal rearrangement is that sequences of literal characters are no
260     longer handled as strings. Instead, each character is handled on its own. This
261     makes some UTF-8 handling easier, and makes the support of partial matching
262     possible. Compiled patterns containing long literal strings will be larger as a
263     result of this change; I hope that performance will not be much affected.
264    
265    
266 nigel 73 Release 4.5 01-Dec-03
267     ---------------------
268    
269     Again mainly a bug-fix and tidying release, with only a couple of new features:
270    
271     1. It's possible now to compile PCRE so that it does not use recursive
272     function calls when matching. Instead it gets memory from the heap. This slows
273     things down, but may be necessary on systems with limited stacks.
274    
275     2. UTF-8 string checking has been tightened to reject overlong sequences and to
276     check that a starting offset points to the start of a character. Failure of the
277     latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
278    
279     3. PCRE can now be compiled for systems that use EBCDIC code.
280    
281    
282 nigel 71 Release 4.4 21-Aug-03
283     ---------------------
284    
285     This is mainly a bug-fix and tidying release. The only new feature is that PCRE
286     checks UTF-8 strings for validity by default. There is an option to suppress
287     this, just in case anybody wants that teeny extra bit of performance.
288    
289    
290     Releases 4.1 - 4.3
291     ------------------
292    
293     Sorry, I forgot about updating the NEWS file for these releases. Please take a
294     look at ChangeLog.
295    
296    
297 nigel 63 Release 4.0 17-Feb-03
298     ---------------------
299    
300     There have been a lot of changes for the 4.0 release, adding additional
301     functionality and mending bugs. Below is a list of the highlights of the new
302     functionality. For full details of these features, please consult the
303     documentation. For a complete list of changes, see the ChangeLog file.
304    
305     1. Support for Perl's \Q...\E escapes.
306    
307     2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
308     package. They provide some syntactic sugar for simple cases of "atomic
309     grouping".
310    
311     3. Support for the \G assertion. It is true when the current matching position
312     is at the start point of the match.
313    
314     4. A new feature that provides some of the functionality that Perl provides
315     with (?{...}). The facility is termed a "callout". The way it is done in PCRE
316     is for the caller to provide an optional function, by setting pcre_callout to
317     its entry point. To get the function called, the regex must include (?C) at
318     appropriate points.
319    
320     5. Support for recursive calls to individual subpatterns. This makes it really
321     easy to get totally confused.
322    
323     6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
324     name a group.
325    
326     7. Several extensions to UTF-8 support; it is now fairly complete. There is an
327     option for pcregrep to make it operate in UTF-8 mode.
328    
329     8. The single man page has been split into a number of separate man pages.
330     These also give rise to individual HTML pages which are put in a separate
331     directory. There is an index.html page that lists them all. Some hyperlinking
332     between the pages has been installed.
333    
334    
335 nigel 53 Release 3.5 15-Aug-01
336     ---------------------
337    
338     1. The configuring system has been upgraded to use later versions of autoconf
339     and libtool. By default it builds both a shared and a static library if the OS
340     supports it. You can use --disable-shared or --disable-static on the configure
341     command if you want only one of them.
342    
343     2. The pcretest utility is now installed along with pcregrep because it is
344     useful for users (to test regexs) and by doing this, it automatically gets
345     relinked by libtool. The documentation has been turned into a man page, so
346     there are now .1, .txt, and .html versions in /doc.
347    
348     3. Upgrades to pcregrep:
349     (i) Added long-form option names like gnu grep.
350     (ii) Added --help to list all options with an explanatory phrase.
351     (iii) Added -r, --recursive to recurse into sub-directories.
352     (iv) Added -f, --file to read patterns from a file.
353    
354     4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
355     script, to force use of CR or LF instead of \n in the source. On non-Unix
356     systems, the value can be set in config.h.
357    
358     5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
359     absolute limit. Changed the text of the error message to make this clear, and
360     likewise updated the man page.
361    
362     6. The limit of 99 on the number of capturing subpatterns has been removed.
363     The new limit is 65535, which I hope will not be a "real" limit.
364    
365    
366 nigel 49 Release 3.3 01-Aug-00
367     ---------------------
368    
369     There is some support for UTF-8 character strings. This is incomplete and
370     experimental. The documentation describes what is and what is not implemented.
371     Otherwise, this is just a bug-fixing release.
372    
373    
374 nigel 43 Release 3.0 01-Feb-00
375     ---------------------
376 nigel 41
377 nigel 43 1. A "configure" script is now used to configure PCRE for Unix systems. It
378     builds a Makefile, a config.h file, and the pcre-config script.
379    
380     2. PCRE is built as a shared library by default.
381    
382     3. There is support for POSIX classes such as [:alpha:].
383    
384     5. There is an experimental recursion feature.
385    
386 nigel 41 ----------------------------------------------------------------------------
387     IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
388    
389     Please note that there has been a change in the API such that a larger
390     ovector is required at matching time, to provide some additional workspace.
391     The new man page has details. This change was necessary in order to support
392     some of the new functionality in Perl 5.005.
393    
394     IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
395    
396     Another (I hope this is the last!) change has been made to the API for the
397     pcre_compile() function. An additional argument has been added to make it
398     possible to pass over a pointer to character tables built in the current
399     locale by pcre_maketables(). To use the default tables, this new arguement
400     should be passed as NULL.
401    
402     IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
403    
404     Yet another (and again I hope this really is the last) change has been made
405     to the API for the pcre_exec() function. An additional argument has been
406     added to make it possible to start the match other than at the start of the
407     subject string. This is important if there are lookbehinds. The new man
408     page has the details, but you just want to convert existing programs, all
409     you need to do is to stick in a new fifth argument to pcre_exec(), with a
410     value of zero. For example, change
411    
412     pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
413     to
414     pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
415    
416     ****

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