[boost] Re: [regex] regex_replace with format string replaced asitis

From: Lorenzo Bettini (bettini_at_[hidden])
Date: 2005-06-06 08:46:08

John Maddock wrote:
>>> Sorry, I'm being dense today: what do you mean by that?
>>
>>
>> instead of checking every what[i].matched as in the following
>>
>> for (unsigned int i = 1; i < what.size(); ++i) {
>> if (what[i].matched) {
>>
>> I'd like to be able to have the subexpressions that matched accessible 
>> directly.  Something like
>>
>> for (unsigned int i = 1; i < what.submatched.size(); ++i) {
>>
>> so, if I have, say, 10 subexpressions, and only two matched, instead 
>> of checking every what[i] (for i = 0..9), I could access directly to 
>> those two subexpressions.  It'd be much more efficient.
> 
> 
> Hmm, it depends on what you want to do I guess: how would tell what 
> index those two sub-expressions were, or don't you care?  It also means 
> a complete rewrite of the match_results interface, and probably the code 
> that finds matches as well - it all assumes that match_results is 
> basically an array of N sub-expressions.

well, since what[] is already an array of n subexpressions, during 
finding of matches, I suppose, you set all the fields of what[i], if the 
i-th subexpression matched.  While you're doing this, you could also 
store the index i into another structure of what.

I hope I explained this correctly...

Lorenzo