Here is the regular expression I've been using to validate credit card numbers in JavaScript:
var match = /^(?:(4[0-9]{12}(?:[0-9]{3})?)|(5[1-5][0-9]{14})|?(6(?:011|5[0-9]{2})[0-9]{12})|(3[47][0-9]{13})|(3(?:0[0-5]|[68][0-9])?[0-9]{11})|((?:2131|1800|35[0-9]{3})[0-9]{11}))$/.exec(cardno);Although this code was working fine before, it is now causing an error. Could someone please take a look at it and suggest any necessary changes?
One effective approach is to implement the LUHN test. Learn more about LUHN algorithm here
/*
validateCardNumber( cardNum )
parameters:
This function takes the card number as a text string and applies the Mod 10 formula to its digits.
description:
Mod 10 serves as the check digit formula for supported cards, aiming to validate them.
returns:
It returns true if the number passes the check digit verification.
Otherwise, it returns false.
*/
function validateCardNumber( cardNum ) { // LUHN Formula used for credit card number validation
var array = new Array( cardNum.length );
var index = 0, totalSum = 0;
for( index = 0; index < cardNum.length; ++index ) {
array[index] = parseInt(cardNum.charAt(index));
}
for( index = array.length - 2; index >= 0; index-=2 ) {
array[index] *= 2;
if( array[index] > 9 ) array[index]-=9;
}
for( index = 0; index < array.length; ++index ) {
totalSum += array[index];
}
return (((totalSum%10)==0)?true:false);
}
Visit to input this code snippet: 14})|?(6(. The analyzer will advise removing the question mark since it implies the preceding token is optional, but it's actually followed by an or operator, not a token. Keep in mind that this distinction is crucial compared to using ?:, which signifies a non-capturing group.
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