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          The type syntax_option_type is an implementation
          specific bitmask type (see C++ standard 17.3.2.1.2). Setting its elements
          has the effects listed in the table below, a valid value of type syntax_option_type
          will always have exactly one of the elements normal,
          basic, extended,
          awk, grep,
          egrep, sed,
          literal or perl set.
        
          Note that for convenience all the constants listed here are duplicated
          within the scope of class template basic_regex, so you can use any
          of:
        
boost::regex_constants::constant_name
or
boost::regex::constant_name
or
boost::wregex::constant_name
in an interchangeable manner.