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Revision 159 - (hide annotations) (download)
Wed May 2 10:27:18 2007 UTC (7 years, 11 months ago) by ph10
File size: 14194 byte(s)
Add code to configure.ac to remove -g from default CFLAGS and CXXFLAGS.

1 nigel 41 News about PCRE releases
2     ------------------------
4 ph10 122
5 ph10 157 Release 7.2 30-Apr-07
6     ---------------------
8 ph10 159 Correction to the notes for 7.1: the note about shared libraries for Windows is
9     wrong. Previously, three libraries were built, but each could function
10     independently. For example, the pcreposix library also included all the
11     functions from the basic pcre library. The change is that the three libraries
12     are no longer independent. They are like the Unix libraries. To use the
13     pcreposix functions, for example, you need to link with both the pcreposix and
14 ph10 157 the basic pcre library.
17 ph10 155 Release 7.1 24-Apr-07
18 nigel 93 ---------------------
20 ph10 155 There is only one new feature in this release: a linebreak setting of
21     PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
22     recognizes only CRLF, CR, and LF as linebreaks.
23 ph10 122
24 ph10 155 A few bugs are fixed (see ChangeLog for details), but the major change is a
25     complete re-implementation of the build system. This now has full Autotools
26     support and so is now "standard" in some sense. It should help with compiling
27     PCRE in a wide variety of environments.
29 ph10 146 NOTE: when building shared libraries for Windows, three dlls are now built,
30     called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
31     included in a single dll.
33     Another important change is that the dftables auxiliary program is no longer
34 ph10 128 compiled and run at "make" time by default. Instead, a default set of character
35     tables (assuming ASCII coding) is used. If you want to use dftables to generate
36     the character tables as previously, add --enable-rebuild-chartables to the
37     "configure" command. You must do this if you are compiling PCRE to run on a
38     system that uses EBCDIC code.
39 ph10 122
40 ph10 128 There is a discussion about character tables in the README file. The default is
41     not to use dftables so that that there is no problem when cross-compiling.
44 ph10 122 Release 7.0 19-Dec-06
45     ---------------------
47 nigel 93 This release has a new major number because there have been some internal
48     upheavals to facilitate the addition of new optimizations and other facilities,
49     and to make subsequent maintenance and extension easier. Compilation is likely
50     to be a bit slower, but there should be no major effect on runtime performance.
51     Previously compiled patterns are NOT upwards compatible with this release. If
52     you have saved compiled patterns from a previous release, you will have to
53     re-compile them. Important changes that are visible to users are:
55     1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
56     some more scripts.
58     2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
59     sequence as a newline.
61     3. The \R escape matches a single Unicode newline sequence as a single unit.
63     4. New features that will appear in Perl 5.10 are now in PCRE. These include
64     alternative Perl syntax for named parentheses, and Perl syntax for
65     recursion.
67     5. The C++ wrapper interface has been extended by the addition of a
68     QuoteMeta function and the ability to allow copy construction and
69     assignment.
71     For a complete list of changes, see the ChangeLog file.
74 nigel 91 Release 6.7 04-Jul-06
75     ---------------------
77     The main additions to this release are the ability to use the same name for
78     multiple sets of parentheses, and support for CRLF line endings in both the
79     library and pcregrep (and in pcretest for testing).
81     Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
82     significantly reduced for certain subject strings.
85 nigel 87 Release 6.5 01-Feb-06
86     ---------------------
88     Important changes in this release:
90     1. A number of new features have been added to pcregrep.
92     2. The Unicode property tables have been updated to Unicode 4.1.0, and the
93     supported properties have been extended with script names such as "Arabic",
94     and the derived properties "Any" and "L&". This has necessitated a change to
95     the interal format of compiled patterns. Any saved compiled patterns that
96     use \p or \P must be recompiled.
98     3. The specification of recursion in patterns has been changed so that all
99     recursive subpatterns are automatically treated as atomic groups. Thus, for
100     example, (?R) is treated as if it were (?>(?R)). This is necessary because
101     otherwise there are situations where recursion does not work.
103     See the ChangeLog for a complete list of changes, which include a number of bug
104     fixes and tidies.
107 nigel 77 Release 6.0 07-Jun-05
108     ---------------------
110     The release number has been increased to 6.0 because of the addition of several
111     major new pieces of functionality.
113     A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
114     algorithm, has been added. This has a number of advantages for certain cases,
115     though it does run more slowly, and lacks the ability to capture substrings. On
116     the other hand, it does find all matches, not just the first, and it works
117     better for partial matching. The pcrematching man page discusses the
118     differences.
120     The pcretest program has been enhanced so that it can make use of the new
121     pcre_dfa_exec() matching function and the extra features it provides.
123     The distribution now includes a C++ wrapper library. This is built
124     automatically if a C++ compiler is found. The pcrecpp man page discusses this
125     interface.
127     The code itself has been re-organized into many more files, one for each
128     function, so it no longer requires everything to be linked in when static
129     linkage is used. As a consequence, some internal functions have had to have
130     their names exposed. These functions all have names starting with _pcre_. They
131     are undocumented, and are not intended for use by outside callers.
133     The pcregrep program has been enhanced with new functionality such as
134     multiline-matching and options for output more matching context. See the
135     ChangeLog for a complete list of changes to the library and the utility
136     programs.
139 nigel 75 Release 5.0 13-Sep-04
140     ---------------------
142     The licence under which PCRE is released has been changed to the more
143     conventional "BSD" licence.
145     In the code, some bugs have been fixed, and there are also some major changes
146     in this release (which is why I've increased the number to 5.0). Some changes
147     are internal rearrangements, and some provide a number of new facilities. The
148     new features are:
150     1. There's an "automatic callout" feature that inserts callouts before every
151     item in the regex, and there's a new callout field that gives the position
152     in the pattern - useful for debugging and tracing.
154     2. The extra_data structure can now be used to pass in a set of character
155     tables at exec time. This is useful if compiled regex are saved and re-used
156     at a later time when the tables may not be at the same address. If the
157     default internal tables are used, the pointer saved with the compiled
158     pattern is now set to NULL, which means that you don't need to do anything
159     special unless you are using custom tables.
161     3. It is possible, with some restrictions on the content of the regex, to
162     request "partial" matching. A special return code is given if all of the
163     subject string matched part of the regex. This could be useful for testing
164     an input field as it is being typed.
166     4. There is now some optional support for Unicode character properties, which
167     means that the patterns items such as \p{Lu} and \X can now be used. Only
168     the general category properties are supported. If PCRE is compiled with this
169     support, an additional 90K data structure is include, which increases the
170     size of the library dramatically.
172     5. There is support for saving compiled patterns and re-using them later.
174     6. There is support for running regular expressions that were compiled on a
175     different host with the opposite endianness.
177     7. The pcretest program has been extended to accommodate the new features.
179     The main internal rearrangement is that sequences of literal characters are no
180     longer handled as strings. Instead, each character is handled on its own. This
181     makes some UTF-8 handling easier, and makes the support of partial matching
182     possible. Compiled patterns containing long literal strings will be larger as a
183     result of this change; I hope that performance will not be much affected.
186 nigel 73 Release 4.5 01-Dec-03
187     ---------------------
189     Again mainly a bug-fix and tidying release, with only a couple of new features:
191     1. It's possible now to compile PCRE so that it does not use recursive
192     function calls when matching. Instead it gets memory from the heap. This slows
193     things down, but may be necessary on systems with limited stacks.
195     2. UTF-8 string checking has been tightened to reject overlong sequences and to
196     check that a starting offset points to the start of a character. Failure of the
197     latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
199     3. PCRE can now be compiled for systems that use EBCDIC code.
202 nigel 71 Release 4.4 21-Aug-03
203     ---------------------
205     This is mainly a bug-fix and tidying release. The only new feature is that PCRE
206     checks UTF-8 strings for validity by default. There is an option to suppress
207     this, just in case anybody wants that teeny extra bit of performance.
210     Releases 4.1 - 4.3
211     ------------------
213     Sorry, I forgot about updating the NEWS file for these releases. Please take a
214     look at ChangeLog.
217 nigel 63 Release 4.0 17-Feb-03
218     ---------------------
220     There have been a lot of changes for the 4.0 release, adding additional
221     functionality and mending bugs. Below is a list of the highlights of the new
222     functionality. For full details of these features, please consult the
223     documentation. For a complete list of changes, see the ChangeLog file.
225     1. Support for Perl's \Q...\E escapes.
227     2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
228     package. They provide some syntactic sugar for simple cases of "atomic
229     grouping".
231     3. Support for the \G assertion. It is true when the current matching position
232     is at the start point of the match.
234     4. A new feature that provides some of the functionality that Perl provides
235     with (?{...}). The facility is termed a "callout". The way it is done in PCRE
236     is for the caller to provide an optional function, by setting pcre_callout to
237     its entry point. To get the function called, the regex must include (?C) at
238     appropriate points.
240     5. Support for recursive calls to individual subpatterns. This makes it really
241     easy to get totally confused.
243     6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
244     name a group.
246     7. Several extensions to UTF-8 support; it is now fairly complete. There is an
247     option for pcregrep to make it operate in UTF-8 mode.
249     8. The single man page has been split into a number of separate man pages.
250     These also give rise to individual HTML pages which are put in a separate
251     directory. There is an index.html page that lists them all. Some hyperlinking
252     between the pages has been installed.
255 nigel 53 Release 3.5 15-Aug-01
256     ---------------------
258     1. The configuring system has been upgraded to use later versions of autoconf
259     and libtool. By default it builds both a shared and a static library if the OS
260     supports it. You can use --disable-shared or --disable-static on the configure
261     command if you want only one of them.
263     2. The pcretest utility is now installed along with pcregrep because it is
264     useful for users (to test regexs) and by doing this, it automatically gets
265     relinked by libtool. The documentation has been turned into a man page, so
266     there are now .1, .txt, and .html versions in /doc.
268     3. Upgrades to pcregrep:
269     (i) Added long-form option names like gnu grep.
270     (ii) Added --help to list all options with an explanatory phrase.
271     (iii) Added -r, --recursive to recurse into sub-directories.
272     (iv) Added -f, --file to read patterns from a file.
274     4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
275     script, to force use of CR or LF instead of \n in the source. On non-Unix
276     systems, the value can be set in config.h.
278     5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
279     absolute limit. Changed the text of the error message to make this clear, and
280     likewise updated the man page.
282     6. The limit of 99 on the number of capturing subpatterns has been removed.
283     The new limit is 65535, which I hope will not be a "real" limit.
286 nigel 49 Release 3.3 01-Aug-00
287     ---------------------
289     There is some support for UTF-8 character strings. This is incomplete and
290     experimental. The documentation describes what is and what is not implemented.
291     Otherwise, this is just a bug-fixing release.
294 nigel 43 Release 3.0 01-Feb-00
295     ---------------------
296 nigel 41
297 nigel 43 1. A "configure" script is now used to configure PCRE for Unix systems. It
298     builds a Makefile, a config.h file, and the pcre-config script.
300     2. PCRE is built as a shared library by default.
302     3. There is support for POSIX classes such as [:alpha:].
304     5. There is an experimental recursion feature.
306 nigel 41 ----------------------------------------------------------------------------
309     Please note that there has been a change in the API such that a larger
310     ovector is required at matching time, to provide some additional workspace.
311     The new man page has details. This change was necessary in order to support
312     some of the new functionality in Perl 5.005.
316     Another (I hope this is the last!) change has been made to the API for the
317     pcre_compile() function. An additional argument has been added to make it
318     possible to pass over a pointer to character tables built in the current
319     locale by pcre_maketables(). To use the default tables, this new arguement
320     should be passed as NULL.
324     Yet another (and again I hope this really is the last) change has been made
325     to the API for the pcre_exec() function. An additional argument has been
326     added to make it possible to start the match other than at the start of the
327     subject string. This is important if there are lookbehinds. The new man
328     page has the details, but you just want to convert existing programs, all
329     you need to do is to stick in a new fifth argument to pcre_exec(), with a
330     value of zero. For example, change
332     pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
333     to
334     pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
336     ****


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