[Boost-users] Regex alternation in xpressive

Hello all, I'm trying to match ordinal numbers (1st, 2nd, 3rd, 4th etc) like this. *xpr::as_xpr ("Some Text") * * >> xpr::repeat<1, 2>(_d) * * >> ("st"|"nd"|"rd"|"th") ;* Compilation fails at 3rd line with the following error error C2296: '|' : illegal, left operand has type 'const char [3]' ; what am i missing ? did I give the construct correctly ? Thanks in advance, Surya