http://qs1969.pair.com?node_id=571221


in reply to what is the difference between index and rindex

perldoc -f rindex

s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e