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From: Lorenzo Bettini (bettini_at_[hidden])
Date: 2007-04-27 12:08:34

Eric Niebler wrote:
> John Maddock wrote:
>> Lorenzo Bettini wrote:
>>> Hi
>>> is there any plan to support more than 9 back references in the regex
>>> library?
>> You can have as many marked sub-expressions as you want, and refer to them
>> in the match_results structure once you have a match. What you can't do at
>> present is have a true back-reference say \12 in your expression. This is
>> basically a problem with the regex syntax, so if you know of a good syntax
>> extension that's already in use then it would trivial to support this.
> You could use xpressive, which handles this case. Any \ddd where d is a
> decimal digit is interpreted as a back-reference if
> - The backreference number is less than 10
> -OR-
> - The backreference number is less than or equal to the number of
> capturing groups seen so far.
> I believe that's perl's rule.

OK, thanks, I'll take a look at it... is xpressive compatible with
boost::regex expressions?


Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze
ICQ# lbetto, 16080134     (GNU/Linux User # 158233)

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