/[pcre]/code/trunk/NEWS
ViewVC logotype

Contents of /code/trunk/NEWS

Parent Directory Parent Directory | Revision Log Revision Log


Revision 71 - (show annotations) (download)
Sat Feb 24 21:40:24 2007 UTC (7 years, 7 months ago) by nigel
File size: 5514 byte(s)
Load pcre-4.4 into code/trunk.

1 News about PCRE releases
2 ------------------------
3
4 Release 4.4 21-Aug-03
5 ---------------------
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
110
111 Please note that there has been a change in the API such that a larger
112 ovector is required at matching time, to provide some additional workspace.
113 The new man page has details. This change was necessary in order to support
114 some of the new functionality in Perl 5.005.
115
116 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
117
118 Another (I hope this is the last!) change has been made to the API for the
119 pcre_compile() function. An additional argument has been added to make it
120 possible to pass over a pointer to character tables built in the current
121 locale by pcre_maketables(). To use the default tables, this new arguement
122 should be passed as NULL.
123
124 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
125
126 Yet another (and again I hope this really is the last) change has been made
127 to the API for the pcre_exec() function. An additional argument has been
128 added to make it possible to start the match other than at the start of the
129 subject string. This is important if there are lookbehinds. The new man
130 page has the details, but you just want to convert existing programs, all
131 you need to do is to stick in a new fifth argument to pcre_exec(), with a
132 value of zero. For example, change
133
134 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
135 to
136 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
137
138 ****

webmaster@exim.org
ViewVC Help
Powered by ViewVC 1.1.12