[Boost-users] [boost:regex]does boost:regex support char set substraction?

Hi all, I got another problem here while trying using boost:regex: does boost:regex support char set substraction? For example:I give boost:regex an expression"[a-z]-[d-f]".I would like the boost take the second "-" as and substracion. So this expression is supposed to be translated as "[a-c]|[f-z]".I am wonderring whether boost:regex has such substraction symbols? Thanks && Regards Juan