[boost] [regex] regex_replace with format string replaced as it is

Hi when I use template <class traits, class Allocator, class charT> basic_string<charT> regex_replace(const basic_string<charT>& s, const basic_regex<charT, traits, Allocator>& e, const basic_string<charT>& fmt, match_flag_type flags = match_default); is there a way to make the fmt string be substituted as IT is? I mean if I specify "(\\)", for instance, I want that actually those four characters to be substituted for the occurrences of e in s, without any interpretation of ( and \. Of cource I could escape both ( and \, but I was wondering if there's an option to avoid this. thanks in advance Lorenzo