locale_type imbue(locale_type loc);
Effects: Returns the result of traits_inst.imbue(loc) where traits_inst is a (default initialized) instance of the template type argument traits stored within the object. After a call to imbue the basic_regex object does not match any character sequence.
Effects: Returns the result of traits_inst.getloc() where traits_inst is a (default initialized) instance of the template parameter traits stored within the object.