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Revision 71 - (hide annotations) (download)
Sat Feb 24 21:40:24 2007 UTC (7 years, 5 months ago) by nigel
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Load pcre-4.4 into code/trunk.

1 nigel 41 News about PCRE releases
2     ------------------------
3    
4 nigel 71 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 nigel 63 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 nigel 53 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 nigel 49 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 nigel 43 Release 3.0 01-Feb-00
97     ---------------------
98 nigel 41
99 nigel 43 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 nigel 41 ----------------------------------------------------------------------------
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     ****

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