/[pcre]/code/tags/pcre-6.6/NEWS
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revision 41 by nigel, Sat Feb 24 21:39:17 2007 UTC revision 71 by nigel, Sat Feb 24 21:40:24 2007 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
3    
4  A "configure" script is now used to configure PCRE for Unix systems. It builds  Release 4.4 21-Aug-03
5  a Makefile and a config.h file.  ---------------------
6    
7    This is mainly a bug-fix and tidying release. The only new feature is that PCRE
8    checks UTF-8 strings for validity by default. There is an option to suppress
9    this, just in case anybody wants that teeny extra bit of performance.
10    
11    
12    Releases 4.1 - 4.3
13    ------------------
14    
15    Sorry, I forgot about updating the NEWS file for these releases. Please take a
16    look at ChangeLog.
17    
18    
19    Release 4.0 17-Feb-03
20    ---------------------
21    
22    There have been a lot of changes for the 4.0 release, adding additional
23    functionality and mending bugs. Below is a list of the highlights of the new
24    functionality. For full details of these features, please consult the
25    documentation. For a complete list of changes, see the ChangeLog file.
26    
27    1. Support for Perl's \Q...\E escapes.
28    
29    2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
30    package. They provide some syntactic sugar for simple cases of "atomic
31    grouping".
32    
33    3. Support for the \G assertion. It is true when the current matching position
34    is at the start point of the match.
35    
36    4. A new feature that provides some of the functionality that Perl provides
37    with (?{...}). The facility is termed a "callout". The way it is done in PCRE
38    is for the caller to provide an optional function, by setting pcre_callout to
39    its entry point. To get the function called, the regex must include (?C) at
40    appropriate points.
41    
42    5. Support for recursive calls to individual subpatterns. This makes it really
43    easy to get totally confused.
44    
45    6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
46    name a group.
47    
48    7. Several extensions to UTF-8 support; it is now fairly complete. There is an
49    option for pcregrep to make it operate in UTF-8 mode.
50    
51    8. The single man page has been split into a number of separate man pages.
52    These also give rise to individual HTML pages which are put in a separate
53    directory. There is an index.html page that lists them all. Some hyperlinking
54    between the pages has been installed.
55    
56    
57    Release 3.5 15-Aug-01
58    ---------------------
59    
60    1. The configuring system has been upgraded to use later versions of autoconf
61    and libtool. By default it builds both a shared and a static library if the OS
62    supports it. You can use --disable-shared or --disable-static on the configure
63    command if you want only one of them.
64    
65    2. The pcretest utility is now installed along with pcregrep because it is
66    useful for users (to test regexs) and by doing this, it automatically gets
67    relinked by libtool. The documentation has been turned into a man page, so
68    there are now .1, .txt, and .html versions in /doc.
69    
70    3. Upgrades to pcregrep:
71       (i)   Added long-form option names like gnu grep.
72       (ii)  Added --help to list all options with an explanatory phrase.
73       (iii) Added -r, --recursive to recurse into sub-directories.
74       (iv)  Added -f, --file to read patterns from a file.
75    
76    4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
77    script, to force use of CR or LF instead of \n in the source. On non-Unix
78    systems, the value can be set in config.h.
79    
80    5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
81    absolute limit. Changed the text of the error message to make this clear, and
82    likewise updated the man page.
83    
84    6. The limit of 99 on the number of capturing subpatterns has been removed.
85    The new limit is 65535, which I hope will not be a "real" limit.
86    
87    
88    Release 3.3 01-Aug-00
89    ---------------------
90    
91    There is some support for UTF-8 character strings. This is incomplete and
92    experimental. The documentation describes what is and what is not implemented.
93    Otherwise, this is just a bug-fixing release.
94    
95    
96    Release 3.0 01-Feb-00
97    ---------------------
98    
99    1. A "configure" script is now used to configure PCRE for Unix systems. It
100    builds a Makefile, a config.h file, and the pcre-config script.
101    
102    2. PCRE is built as a shared library by default.
103    
104    3. There is support for POSIX classes such as [:alpha:].
105    
106    5. There is an experimental recursion feature.
107    
108  ----------------------------------------------------------------------------  ----------------------------------------------------------------------------
109            IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00            IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00

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