http://gitunderground.i2p/archive/youtube-dl/commit/eeafbbc3e59bcd6513053f5c942a55e2ff309488
P<sig>[ \ w $]+) \ ( ' , r ' \ b[ \ w ]+ \ s*&& \ s*[ \ w ]+ \ .set \ ([^,]+ \ s*, \ s*encodeURIComponent \ s* \ ( \ s*(?P<sig>[ \ w $]+) \ ( ' , r ' \ bm=(?P<sig>[ \ w $] { 2,}) \ (decodeURIComponent \ (h \ .s \ ) \ ) ' , # Obsolete patterns r ' ( " | \' )signature \ 1 \ s*, \ s*(?P<sig>[ a-zA-Z0-9 $]+) \ ( ' , r ' \ .sig \ | \ |(?