[Boost-users] Xpressive Character Literals

Hello List, Just a quick question; Xpressive seems not to compile when I use 0x?? instead of 'a' for regular expressions. Eg. sregex characters = +(set=0x20,0x0A,0x0D,0x20,0x33); Is there perhaps a way to accomplish this in Xpressive? Thank you, Etienne