[21:49:46] <wm-bb>	 <bgo_eiu> I tried a comparison between a Python implementation calling the regex library to do a replace at end, and an implementation using a composition of other string functions to do the same thing (input کرنا output کرنی)
[21:49:47] <wm-bb>	 <bgo_eiu> Python: 1339 ms
[21:49:48] <wm-bb>	 <bgo_eiu> Compisition: 2375 ms
[21:49:50] <wm-bb>	 <bgo_eiu> 
[21:49:51] <wm-bb>	 <bgo_eiu> More substantial than I was expecting (re @vrandecic: It depends on the algorithm. My intuitions about this have been surprisingly often wrong. Try it out!)