[Boost-users] [xpressive] multiple matches for a group

From: Cory Nelson (phrosty_at_[hidden])
Date: 2005-09-25 21:09:49

I'm attempting to learn xpressive by writing a simple IRC regex.

The IRC protocol goes like:
:prefix numericreplyorcommandstring param1 param2 :trailing param

The regex looks like this (ignore comments and newlines):
^
(?::(\S+)\s)?	// prefix
(?:(\d+)|(\S+))	// command
(?:\s([^:]\S*))*	// parameters
(?:\s:(.+))?		// trailing parameter
$

And my static xpressive looks like this:
bos >>
optional(':' >> (s1=+~_s) >> _s) >>		// prefix
((s2=+_d)|(s3=+~_s)) >>				// command
*(_s >> (s4 = ~as_xpr(':') >> *~_s)) >>		// parameters
optional(_s >> ':' >> (s5=+_)) >>			// trailing parameter
eos

I'm not sure how to retrieve the multiple matches for s4 - any help?

--
Cory Nelson
http://www.int64.org