Re: [Boost-users] [Regex] Is it possible to assign an alias to a subexpression (to use later instead of its index)?

From: John Maddock (john_at_[hidden])
Date: 2005-04-01 04:58:23

> I would like to know if it's possible to assign an alias/name to a 
> sub-expression.  When using short regex there is no problem nor confusion 
> but when using a long regex then I get lost looking at the correct index 
> to use.  It would be much easier if I can assign an alias.
>
> So, instead  to use a regex like this:
>
> "\s*(\d+)\s+(\d+)\s+(\d+)\s+"
>
> I would like to be able to use something like:
>
> "\s*([$VALUE1]\d+)\s+([$VALUE2]\d+)\s+([$VALUE3]\d+)\s+"
>
> I don't know if this feature exists in regex but I haven't found it but 
> maybe I dind't know where to find...

No that's not supported, but don't forget that you can always use 
non-marking parenthesis to avoid throwing out too many fields.

John.