grammar Code { rule comment { "/**" ~ "**/" $<data>=.*? } rule TOP { ^ <first=.comment>? .*? <last=.comment>? $ } } say Code.parse: "/** start **/ testing"; say Code.parse: "testing/** end **/"; say Code.parse: "/** start **/testing/** end **/"; say Code.parse: "testing /** inside **/ testing"; say Code.parse: "test/** inside **/ing/** end **/"; say Code.parse: "/** start **/tes/** inside**/ting/** end **/"; say Code.parse: "testing";