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Revision 63 - (show annotations) (download)
Sat Feb 24 21:40:03 2007 UTC (7 years, 9 months ago) by nigel
File size: 5101 byte(s)
Load pcre-4.0 into code/trunk.

1 News about PCRE releases
2 ------------------------
3
4 Release 4.0 17-Feb-03
5 ---------------------
6
7 There have been a lot of changes for the 4.0 release, adding additional
8 functionality and mending bugs. Below is a list of the highlights of the new
9 functionality. For full details of these features, please consult the
10 documentation. For a complete list of changes, see the ChangeLog file.
11
12 1. Support for Perl's \Q...\E escapes.
13
14 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
15 package. They provide some syntactic sugar for simple cases of "atomic
16 grouping".
17
18 3. Support for the \G assertion. It is true when the current matching position
19 is at the start point of the match.
20
21 4. A new feature that provides some of the functionality that Perl provides
22 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
23 is for the caller to provide an optional function, by setting pcre_callout to
24 its entry point. To get the function called, the regex must include (?C) at
25 appropriate points.
26
27 5. Support for recursive calls to individual subpatterns. This makes it really
28 easy to get totally confused.
29
30 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
31 name a group.
32
33 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
34 option for pcregrep to make it operate in UTF-8 mode.
35
36 8. The single man page has been split into a number of separate man pages.
37 These also give rise to individual HTML pages which are put in a separate
38 directory. There is an index.html page that lists them all. Some hyperlinking
39 between the pages has been installed.
40
41
42 Release 3.5 15-Aug-01
43 ---------------------
44
45 1. The configuring system has been upgraded to use later versions of autoconf
46 and libtool. By default it builds both a shared and a static library if the OS
47 supports it. You can use --disable-shared or --disable-static on the configure
48 command if you want only one of them.
49
50 2. The pcretest utility is now installed along with pcregrep because it is
51 useful for users (to test regexs) and by doing this, it automatically gets
52 relinked by libtool. The documentation has been turned into a man page, so
53 there are now .1, .txt, and .html versions in /doc.
54
55 3. Upgrades to pcregrep:
56 (i) Added long-form option names like gnu grep.
57 (ii) Added --help to list all options with an explanatory phrase.
58 (iii) Added -r, --recursive to recurse into sub-directories.
59 (iv) Added -f, --file to read patterns from a file.
60
61 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
62 script, to force use of CR or LF instead of \n in the source. On non-Unix
63 systems, the value can be set in config.h.
64
65 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
66 absolute limit. Changed the text of the error message to make this clear, and
67 likewise updated the man page.
68
69 6. The limit of 99 on the number of capturing subpatterns has been removed.
70 The new limit is 65535, which I hope will not be a "real" limit.
71
72
73 Release 3.3 01-Aug-00
74 ---------------------
75
76 There is some support for UTF-8 character strings. This is incomplete and
77 experimental. The documentation describes what is and what is not implemented.
78 Otherwise, this is just a bug-fixing release.
79
80
81 Release 3.0 01-Feb-00
82 ---------------------
83
84 1. A "configure" script is now used to configure PCRE for Unix systems. It
85 builds a Makefile, a config.h file, and the pcre-config script.
86
87 2. PCRE is built as a shared library by default.
88
89 3. There is support for POSIX classes such as [:alpha:].
90
91 5. There is an experimental recursion feature.
92
93 ----------------------------------------------------------------------------
94 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
95
96 Please note that there has been a change in the API such that a larger
97 ovector is required at matching time, to provide some additional workspace.
98 The new man page has details. This change was necessary in order to support
99 some of the new functionality in Perl 5.005.
100
101 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
102
103 Another (I hope this is the last!) change has been made to the API for the
104 pcre_compile() function. An additional argument has been added to make it
105 possible to pass over a pointer to character tables built in the current
106 locale by pcre_maketables(). To use the default tables, this new arguement
107 should be passed as NULL.
108
109 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
110
111 Yet another (and again I hope this really is the last) change has been made
112 to the API for the pcre_exec() function. An additional argument has been
113 added to make it possible to start the match other than at the start of the
114 subject string. This is important if there are lookbehinds. The new man
115 page has the details, but you just want to convert existing programs, all
116 you need to do is to stick in a new fifth argument to pcre_exec(), with a
117 value of zero. For example, change
118
119 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
120 to
121 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
122
123 ****

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