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Revision 73 - (show annotations) (download)
Sat Feb 24 21:40:30 2007 UTC (7 years, 2 months ago) by nigel
File size: 6142 byte(s)
Load pcre-4.5 into code/trunk.

1 News about PCRE releases
2 ------------------------
3
4 Release 4.5 01-Dec-03
5 ---------------------
6
7 Again mainly a bug-fix and tidying release, with only a couple of new features:
8
9 1. It's possible now to compile PCRE so that it does not use recursive
10 function calls when matching. Instead it gets memory from the heap. This slows
11 things down, but may be necessary on systems with limited stacks.
12
13 2. UTF-8 string checking has been tightened to reject overlong sequences and to
14 check that a starting offset points to the start of a character. Failure of the
15 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
16
17 3. PCRE can now be compiled for systems that use EBCDIC code.
18
19
20 Release 4.4 21-Aug-03
21 ---------------------
22
23 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
24 checks UTF-8 strings for validity by default. There is an option to suppress
25 this, just in case anybody wants that teeny extra bit of performance.
26
27
28 Releases 4.1 - 4.3
29 ------------------
30
31 Sorry, I forgot about updating the NEWS file for these releases. Please take a
32 look at ChangeLog.
33
34
35 Release 4.0 17-Feb-03
36 ---------------------
37
38 There have been a lot of changes for the 4.0 release, adding additional
39 functionality and mending bugs. Below is a list of the highlights of the new
40 functionality. For full details of these features, please consult the
41 documentation. For a complete list of changes, see the ChangeLog file.
42
43 1. Support for Perl's \Q...\E escapes.
44
45 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
46 package. They provide some syntactic sugar for simple cases of "atomic
47 grouping".
48
49 3. Support for the \G assertion. It is true when the current matching position
50 is at the start point of the match.
51
52 4. A new feature that provides some of the functionality that Perl provides
53 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
54 is for the caller to provide an optional function, by setting pcre_callout to
55 its entry point. To get the function called, the regex must include (?C) at
56 appropriate points.
57
58 5. Support for recursive calls to individual subpatterns. This makes it really
59 easy to get totally confused.
60
61 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
62 name a group.
63
64 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
65 option for pcregrep to make it operate in UTF-8 mode.
66
67 8. The single man page has been split into a number of separate man pages.
68 These also give rise to individual HTML pages which are put in a separate
69 directory. There is an index.html page that lists them all. Some hyperlinking
70 between the pages has been installed.
71
72
73 Release 3.5 15-Aug-01
74 ---------------------
75
76 1. The configuring system has been upgraded to use later versions of autoconf
77 and libtool. By default it builds both a shared and a static library if the OS
78 supports it. You can use --disable-shared or --disable-static on the configure
79 command if you want only one of them.
80
81 2. The pcretest utility is now installed along with pcregrep because it is
82 useful for users (to test regexs) and by doing this, it automatically gets
83 relinked by libtool. The documentation has been turned into a man page, so
84 there are now .1, .txt, and .html versions in /doc.
85
86 3. Upgrades to pcregrep:
87 (i) Added long-form option names like gnu grep.
88 (ii) Added --help to list all options with an explanatory phrase.
89 (iii) Added -r, --recursive to recurse into sub-directories.
90 (iv) Added -f, --file to read patterns from a file.
91
92 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
93 script, to force use of CR or LF instead of \n in the source. On non-Unix
94 systems, the value can be set in config.h.
95
96 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
97 absolute limit. Changed the text of the error message to make this clear, and
98 likewise updated the man page.
99
100 6. The limit of 99 on the number of capturing subpatterns has been removed.
101 The new limit is 65535, which I hope will not be a "real" limit.
102
103
104 Release 3.3 01-Aug-00
105 ---------------------
106
107 There is some support for UTF-8 character strings. This is incomplete and
108 experimental. The documentation describes what is and what is not implemented.
109 Otherwise, this is just a bug-fixing release.
110
111
112 Release 3.0 01-Feb-00
113 ---------------------
114
115 1. A "configure" script is now used to configure PCRE for Unix systems. It
116 builds a Makefile, a config.h file, and the pcre-config script.
117
118 2. PCRE is built as a shared library by default.
119
120 3. There is support for POSIX classes such as [:alpha:].
121
122 5. There is an experimental recursion feature.
123
124 ----------------------------------------------------------------------------
125 IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
126
127 Please note that there has been a change in the API such that a larger
128 ovector is required at matching time, to provide some additional workspace.
129 The new man page has details. This change was necessary in order to support
130 some of the new functionality in Perl 5.005.
131
132 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
133
134 Another (I hope this is the last!) change has been made to the API for the
135 pcre_compile() function. An additional argument has been added to make it
136 possible to pass over a pointer to character tables built in the current
137 locale by pcre_maketables(). To use the default tables, this new arguement
138 should be passed as NULL.
139
140 IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
141
142 Yet another (and again I hope this really is the last) change has been made
143 to the API for the pcre_exec() function. An additional argument has been
144 added to make it possible to start the match other than at the start of the
145 subject string. This is important if there are lookbehinds. The new man
146 page has the details, but you just want to convert existing programs, all
147 you need to do is to stick in a new fifth argument to pcre_exec(), with a
148 value of zero. For example, change
149
150 pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
151 to
152 pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
153
154 ****

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