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| Regular Expressions | | Language: | JavaScript | | Author: | Jon Lokken | | Date: | 3-12-2015 | |
| | Description: | | Use a regular expression to validate a credit card number before processing via the Luhn algorithm. Sample card numbers can be found at Paypal.
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Visa Card: Cards start with a 4 and have either 13 or 16 digits.
RegExp: ^4[0-9]{12}(?:[0-9]{3})?$
Master Cards: Cards start with a 51-55 and have 16 digits.
RegExp: ^5[1-5][0-9]{14}$
American Express: Cards start with a 34 or 37 and have 15 digits.
RegExp: ^3[47][0-9]{13}$
Diners Club: Cards start with a 300-305, 36 or 38 and have 14 digits. Some start with a 5 and have 16 digits. These are joint venture cards between Diners Club and Mastercard. The joint cards should be processed like a MasterCard.
RegExp: ^3(?:0[0-5]|[68][0-9])[0-9]{11}$
Discover: Discover Cards start with a 6011 or 65 and have 16 digits.
RegExp: ^6(?:011|5[0-9]{2})[0-9]{12}$
JCB: Cards start with a 2131 or 1800 and have 15 digits. Some start with a 35 and have 16 digits.
RegExp: ^(?:2131|1800|35[0-9]{3})[0-9]{11}$
Luhn Algorithm:
function valid_credit_card(value) {
if (/[^0-9-\s]+/.test(value)) return false;
var nCheck = 0, nDigit = 0, bEven = false;
value = value.replace(/\D/g, "");
for (var n = value.length - 1; n >= 0; n--) {
var cDigit = value.charAt(n),
nDigit = parseInt(cDigit, 10);
if (bEven) {
if ((nDigit *= 2) > 9) nDigit -= 9;
}
nCheck += nDigit;
bEven = !bEven;
}
return (nCheck % 10) == 0;
}
Test CardsCredit Card Type: Credit Card Number
American Express: 378282246310005
American Express: 371449635398431
American Express Corporate: 378734493671000
Australian BankCard: 5610591081018250
Diners Club: 30569309025904
Diners Club: 38520000023237
Discover: 6011111111111117
Discover: 6011000990139424
JCB: 3530111333300000
JCB: 3566002020360505
MasterCard: 5555555555554444
MasterCard: 5105105105105100
Visa: 4111111111111111
Visa: 4012888888881881
Visa: 4222222222222Note : Even though this number has a different character count than the other test numbers, it is the correct and functional number.Processor-specific Cards
Dankort (PBS): 76009244561
Dankort (PBS): 5019717010103742
Switch/Solo (Paymentech): 6331101999990016
| Disclaimer: | | Feel free to use this tool. I take no responsibility for this code working, imply no warranty as to it's validity, and will not be held liable if you decide to try it. | |
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AJAX
JavaScript