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News about PCRE releases |
News about PCRE releases |
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Release 4.0 17-Feb-03 |
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There have been a lot of changes for the 4.0 release, adding additional |
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functionality and mending bugs. Below is a list of the highlights of the new |
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functionality. For full details of these features, please consult the |
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documentation. For a complete list of changes, see the ChangeLog file. |
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1. Support for Perl's \Q...\E escapes. |
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2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java |
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package. They provide some syntactic sugar for simple cases of "atomic |
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grouping". |
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3. Support for the \G assertion. It is true when the current matching position |
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is at the start point of the match. |
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4. A new feature that provides some of the functionality that Perl provides |
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with (?{...}). The facility is termed a "callout". The way it is done in PCRE |
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is for the caller to provide an optional function, by setting pcre_callout to |
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its entry point. To get the function called, the regex must include (?C) at |
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appropriate points. |
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5. Support for recursive calls to individual subpatterns. This makes it really |
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easy to get totally confused. |
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6. Support for named subpatterns. The Python syntax (?P<name>...) is used to |
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name a group. |
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7. Several extensions to UTF-8 support; it is now fairly complete. There is an |
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option for pcregrep to make it operate in UTF-8 mode. |
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8. The single man page has been split into a number of separate man pages. |
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These also give rise to individual HTML pages which are put in a separate |
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directory. There is an index.html page that lists them all. Some hyperlinking |
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between the pages has been installed. |
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Release 3.5 15-Aug-01 |
Release 3.5 15-Aug-01 |
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