gistfile1.txt

function valid($setting, $string) {
	if($setting == "email") {
		if(preg_match("/^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/", $string)) {
			return true;
		} else {
			return false;
		}
	} elseif($setting == "website") {
		if(preg_match("/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/", $string)) {
			return true;
		} else {
			return false;
		}
	} elseif($setting == "username") {
		if(preg_match("/^[a-z0-9_-]{3,16}$/", $string)) {
			return true;
		} else {
			return false;
		}
	}
}