public static CreditCardTypeId GetCardTypeFromNumber2(string cardNum)
{
// Compare the supplied card number with the regex pattern and get reference regex named groups
// NOTE: this does not mean the card is valid format/length, just that it resembles a type.
// Assume clean cardNum.
GroupCollection gc = _cardRegex1.Value.Match(cardNum).Groups;
for (CreditCardTypeId id = CreditCardTypeId.Visa; id <= CreditCardTypeId.DinersClub; id++)
{
// Compare each card type to the named groups to determine which card type the number matches
if (gc[id.ToString()].Success)
{
return(id);
}
}
// Card type is not supported by our system, return null
return(CreditCardTypeId.Unk);
}
public static bool IsValidNumber2(string cardNum, CreditCardTypeId cardType)
{
// Assume clean cardNum.
if (!IsValidType(cardType))
{
return(false);
}
if (!IsValidLength(cardNum.Length, cardType))
{
return(false);
}
// Make sure the supplied number matches the supplied card type
if (!_cardRegex1.Value.Match(cardNum).Groups[cardType.ToString()].Success)
{
return(false); // The card number does not match the card type
}
// all cards use Luhn's alg
return(IsValidLuhn2(cardNum));
}