Get Credit Card Type

How to get C-card type, how to know the input card number is Visa or Master Card ?
here the code for CreditCard.cs

public class CreditCard
{
    private string AmericanExpressPattern => @"^3[47][0-9]{13}$";
    private string MasterCardPattern => @"^5[1-5][0-9]{14}$";
    private string VisaCardPattern => @"^4[0-9]{12}(?:[0-9]{3})?$";
    private string DinersClubCardPattern => @"^3(?:0[0-5]|[68][0-9])[0-9]{11}$";
    private string EnRouteCardPattern => @"^(2014|2149)";
    private string DiscoverCardPattern => @"^6(?:011|5[0-9]{2})[0-9]{12}$";
    private string JcbCardPattern => @"^(?:2131|1800|35\d{3})\d{11}$";


    private Dictionary CreditRegxs { get; set; }

    public CreditCard()
    {
        CreditRegxs = new Dictionary()
        {
            {"American Express",AmericanExpressPattern},
            {"Mastercard",MasterCardPattern},
            {"Visa",VisaCardPattern},
            {"Diners Club",DinersClubCardPattern},
            {"En Route",EnRouteCardPattern},
            {"Discover",DiscoverCardPattern},
            {"JCB ",JcbCardPattern},
        };
    }

    public string GetCreditCardType(string cardNumber)
    {
        string cardType = "Unknown";
        try
        {
            string cardNum = cardNumber.Replace(" ", "").Replace("-", "");
            foreach (string cardTypeName in CreditRegxs.Keys)
            {
                Regex regex = new Regex(CreditRegxs[cardTypeName]);
                if (regex.IsMatch(cardNum))
                {
                    cardType = cardTypeName;
                    break;
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
        }
        return cardType;
    }

}

Add Helper Class to use it

public static class CreditCardHelper
{
    public static string GetCreditCardType(this string cardNumber)
    {
        return  new CreditCard().GetCreditCardType(cardNumber);
    }
}

Example to use The class :

static void Main(string[] args)
{
     var card = "4111 1111 1111 1111";
     Console.WriteLine(card.GetCreditCardType());
}

To download full code from GitHub Here