serach index in flex

private function removeBracket(strNo:String):Number
{
var reg:RegExp = new RegExp("[\(]","i");
var int_no:int = strNo.search(reg);
var retNo:Number;
if (int_no >= 0)
{
strNo = strNo.replace("(","");
strNo = strNo.replace(")","");
strNo = strNo.replace(",","");
retNo = Number(strNo);
}
else
{
// do some thing
}
return retNo;
}