s/o.*ra/onaraion/ s/iwa/&n/ s/tou/&sagi/ s/nwa/&ni/ s/you$/&nagi/ s/ekimasu/&kanku/ s/akima/&u/ s/aima/&nbou/ s/ama/&usu/ s/^su.*/yukaina / s/^m.*/tanoshii / s/ /&nakamaga popopopo-n/
Note that non-ascii characters in the above source code will be escaped (such as \x9f).