Re: [boost] [Review] xpressive

From: Darren Cook (darren_at_[hidden])
Date: 2005-09-16 18:26:04

>>I understand what you're saying, but I don't agree that it's that for solely
>>for legacy reasons. In practice, the only reason why you might iterator over
>>all sub-matches is to print them out. Otherwise, the sub-matches are accessed
>>randomly, because (for example) the 1st sub-match is a date and the 3rd
>>sub-match is an email address, and I'm not interested in the 2nd. See?
> 
> ...
> interface provide that task easily.  Similarly, we may run into a situation
> where people commonly do non-random iterations through your "what" list.

It is hard to think of when you will need to: normally you are using a
regex because the data in different parts of the string has different
meaning.

When the fields are regular you'll normally use regex_token_iterator<>
instead, and that is STL-friendly.

> It looks like the current setup is not STL-friendly.  Most of the "what"
> list is one type of thing, the in-order pieces of the regex parse.

Skipping over the first element is not that hard for the unusual cases
where regex_token_iterator<> is not what you needed.

Darren