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revision 73 by nigel, Sat Feb 24 21:40:30 2007 UTC revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
4    Release 5.0 13-Sep-04
5    ---------------------
7    The licence under which PCRE is released has been changed to the more
8    conventional "BSD" licence.
10    In the code, some bugs have been fixed, and there are also some major changes
11    in this release (which is why I've increased the number to 5.0). Some changes
12    are internal rearrangements, and some provide a number of new facilities. The
13    new features are:
15    1. There's an "automatic callout" feature that inserts callouts before every
16       item in the regex, and there's a new callout field that gives the position
17       in the pattern - useful for debugging and tracing.
19    2. The extra_data structure can now be used to pass in a set of character
20       tables at exec time. This is useful if compiled regex are saved and re-used
21       at a later time when the tables may not be at the same address. If the
22       default internal tables are used, the pointer saved with the compiled
23       pattern is now set to NULL, which means that you don't need to do anything
24       special unless you are using custom tables.
26    3. It is possible, with some restrictions on the content of the regex, to
27       request "partial" matching. A special return code is given if all of the
28       subject string matched part of the regex. This could be useful for testing
29       an input field as it is being typed.
31    4. There is now some optional support for Unicode character properties, which
32       means that the patterns items such as \p{Lu} and \X can now be used. Only
33       the general category properties are supported. If PCRE is compiled with this
34       support, an additional 90K data structure is include, which increases the
35       size of the library dramatically.
37    5. There is support for saving compiled patterns and re-using them later.
39    6. There is support for running regular expressions that were compiled on a
40       different host with the opposite endianness.
42    7. The pcretest program has been extended to accommodate the new features.
44    The main internal rearrangement is that sequences of literal characters are no
45    longer handled as strings. Instead, each character is handled on its own. This
46    makes some UTF-8 handling easier, and makes the support of partial matching
47    possible. Compiled patterns containing long literal strings will be larger as a
48    result of this change; I hope that performance will not be much affected.
51  Release 4.5 01-Dec-03  Release 4.5 01-Dec-03
52  ---------------------  ---------------------

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