@@40@@
/\W19(th)?\scentury/
/\W18\d\d\W/
-10 /\W17(0|1|2|3|4)\d\W/
-10 /\W(12|13|14|15|16|17|18|20)(th)?\scentury/
-10 /\W1(1|2|3|4|5|6)\d\d\W/