Re: [boost] [regex] specify parenthesis

From: John Maddock (john_at_[hidden])
Date: 2007-05-02 04:11:18

Lorenzo Bettini wrote:
> I'll see whether this technique makes my regular expressions harder to
> read than a simple copy and paste solution.
>
> I thought there might be a syntax for it because I read in the regex
> documentation, in the section "Character classes that are supported by
> Unicode Regular Expressions" these syntaxes
>
> Ps  Open Punctuation
> Pe  Close Punctuation
>
> and I thought they might be related (by the way, I actually did not
> understand what they're for, since there's no example).

[[:Ps:]] matches any opening punctuation
[[:Pe:]] matches any closing punctuation

Exactly what that means is defined by the Unicode std, and these are only 
supported by u32regex when Boost.Regex is built with ICU support enabled.

John.