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revision 62 by nigel, Sat Feb 24 21:39:42 2007 UTC revision 63 by nigel, Sat Feb 24 21:40:03 2007 UTC
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1  News about PCRE releases  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  Release 3.5 15-Aug-01
43  ---------------------  ---------------------
44    

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