[pcre-dev] [Bug 623] Negative POSIX named set

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http://bugs.exim.org/show_bug.cgi?id=623




--- Comment #1 from Philip Hazel <ph10@???> 2007-10-23 18:59:57 ---
On Tue, 23 Oct 2007, Felipe Pena wrote:

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> http://bugs.exim.org/show_bug.cgi?id=623
>            Summary: Negative POSIX named set
>            Product: PCRE
>            Version: N/A
>           Platform: x86
>         OS/Version: Linux
>             Status: NEW
>           Severity: bug
>           Priority: medium
>          Component: Documentation
>         AssignedTo: ph10@???
>         ReportedBy: felipensp@???
>                 CC: pcre-dev@???

>
>
> I don't knew than PCRE supported negative posix named, then found in
> PCRESYNTAX(3): "[[^:xxx:]] negative POSIX named set".
> But, it's don't works.
>
> re> /[[^:digit:]]/
> data> 1a
> No match
>
> And this don't is found in PCREPATTERN(3). Although, in PCRESYNTAX(3) said "The
> full syntax and semantics of the regular expressions that are supported by
> PCRE are described in the pcrepattern documentation. This document contains
> just a quick-reference summary of the syntax."

Thank you for the report. This is a bug in PCRESYNTAX(3). The correct
syntax for negative POSIX classes is, for example:

/[[:^digit:]]/

and this is documented in PCREPATTERN, in the section entitled "POSIX
CHARACTER CLASSES", where it says: "Another Perl extension is negation,
which is indicated by a ^ character after the colon. For example,

  [12[:^digit:]]                                                         

matches "1", "2", or any non-digit."

Regards,
Philip


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