function removeCarriageReturnsAndNewLines($myString:String):String {
	var newString:String;
	var findCarriageReturnRegExp:RegExp = new RegExp("\r", "gi");
	newString = $myString.replace(findCarriageReturnRegExp, "");
	var findNewLineRegExp:RegExp = new RegExp("\n", "gi");
	newString = newString.replace(findNewLineRegExp, "");
	return newString;
}

AS3 Remove Carriage Returns And New Lines Using Regular Expressions

regex, replace, regexp

ActionScript 3