js的字符串匹配函数是什么？

String.prototype.finded = function(){
var arg = arguments;
var me = this.toLowerCase();
var re = false;
var list = [];
if (arg.length > 0)
{list = arg[0].toString().split(",");}
for (var i=0;i{ if (me.indexOf(list[i].toLowerCase()) >= 0)
{ re = true;break; }