Re: [boost] [regex] number of back references

From: Lorenzo Bettini (bettini_at_[hidden])
Date: 2007-04-26 12:11:48

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 

yes I'm already using this

> 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 

and that's what I'd need: I need to build a long regex made up by many 
alternatives (each of one is a subexpression), and thus, I reach the 
back-reference limitation quite easily.

> 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.

actually, I've only read by googling that there are some regular 
expression libraries providing more than 9 subexpressions, but I saw no 
pointer to such libraries.

thanks
        Lorenzo

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