^(?P<unit_type>S)(?P<unit_size>6|8|10|15|20|25|30)(?P<mounting_type>A|P)(?P<cracking_pressure>00|02|05|15|30|50|80)(?P<sep_1>-)(?P<unit_series>1X)(?P<sep_2>/|=)(?P<pressure_rating_max>420|450|)(?P<surface_coating>J3|J5|V|)(?P<orifice_position>B|)(?P<orifice_diameter>00|03|05|08|10|12|15|)(?P<pipe_port>/2|/12|)(?P<special_version>(.|[0-9])*)$