Get credit card type [JS]

Get Credit card type [JS]

function getCreditCardType(creditCardNumber) { 
	// start without knowing the credit card type
	var result = "unknown";

	// first check for MasterCard
	if (/^5[1-5]/.test(creditCardNumber)) {
    	result = "mastercard";
	} 
	// then check for Visa
	else if (/^4/.test(creditCardNumber)) {
		result = "visa";
	}
	// then check for AmEx
	else if (/^3[47]/.test(creditCardNumber)) {
		result = "amex";
	} 
	// then check for Diners
	else if (/3(?:0[0-5]|[68][0-9])[0-9]{11}/.test(creditCardNumber)) { 
		result = "diners"
	}
	// then check for Discover
	else if (/6(?:011|5[0-9]{2})[0-9]{12}/.test(creditCardNumber)) {
		result = "discover";
	} 
	// then check for Maestro
	else if (/^(5[06-8]|6\d)\d{14}(\d{2,3})?$/.test(creditCardNumber)) {
		result = "maestro";
	} 
	
	return result;
}