[Boost-users] Re: spirit question

From: Jeffrey Holle (jeff.holle_at_[hidden])
Date: 2004-11-06 11:13:05

Of "course".
That is what the optional operator is for.
Something like:
   *alpha_p << !(ch_p('-') << *digit_p)

Cory Nelson wrote:
> I'm trying to write a parser with elements that might not occur - is
> this possible?
> 
> like:
> 
> string ['-' number]
> 
> that matches "foo" or "foo-123"
>