/**
* StringReplaceAll
* @param source:String 源數據
* @param find:String 替換對象
* @param replacement:Sring 替換內容
* @return String
* **/
private function StringReplaceAll( source:String, find:String, replacement:String ):String{
return source.split( find ).join( replacement );
}

var str:String = "ab/r/ncd/r/nefhi/r/njkl/rmn/nf";
trace(str.replace(new RegExp("[/r/n /r /n]", "g"), ""));