Re: [Boost-users] Regex alternation in xpressive

On Thu, Mar 11, 2010 at 3:57 AM, Surya Kiran Gullapalli wrote:

On Thu, Mar 11, 2010 at 15:58, OvermindDL1 wrote:

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On Thu, Mar 11, 2010 at 2:29 AM, Surya Kiran Gullapalli wrote:

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    >> ("st"|"nd"|"rd"|"th") ;

That is because "st"|"nd"|etc... you are trying to 'or' two string constants, that makes no sense in C++.  You need to 'infect' the whole line by wrapping the first one with as_xpr as:      >> (as_xpr("st")|"nd"|"rd"|"th") ;

Thanks, it worked. I thought the first as_xpr would infect everything. but i was mistaken.

You enclosed all of those in parenthesis which created a new 'scope' (not by the technical definition, but it works here), thus you need to 're-infect' anew since they get run together before the external definition. :)