Re: [Boost-users] [regex] Perl regex special characters

From: Roman Neuhauser (neuhauser_at_[hidden])
Date: 2006-09-08 12:05:12

# telya_at_[hidden] / 2006-09-08 12:23:36 +0300:
> Hi
>  
>  <http://www.boost.org/libs/regex/doc/syntax_perl.html>
> http://www.boost.org/libs/regex/doc/syntax_perl.html says:
> 
> 
> Perl Regular Expression Syntax
> 
> 
> In Perl regular expressions, all characters match themselves except for the
> following special characters:
> 
> .[{()\*+?|^$

> Q: what about "]}" symbols?

    They're only special if there's a matching "[" or "{" earlier in the
    pattern: 

    > echo 'aaa]}]}]}bbb' | perl -pe 's/(]|})+//'
    aaabbb
    > echo 'aaa]}]}]}bbb' | perl -pe 's/[]}]+//'
    aaabbb
    > echo 'aaa}}}]]]bbb' | perl -pe 's/}+//;s/]+//'
    aaabbb

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