mastercard credit card numbers begin with

In this case, the savings are only a few microseconds. Without the plus, three replacements would be required. If the input has consecutive non-digits, such as 1=2, then + matches the three equals signs at once and deletes them in one replacement.

If you’re wondering what the plus is for: that’s for performance. If this regex looks odd, remember that in a character class, the hyphen is a literal when it occurs right before the closing bracket (or right after the opening bracket or negating caret). If you only want to replace spaces and dashes, you could use +. To remove all non-digits from the card number, simply use the “replace all” function in your scripting language to search for the regex + and replace it with nothing. So your order form should accept card numbers with spaces or dashes in them. Physical credit cards have spaces within the card number to group the digits, making it easier for humans to read or type in. The first step is to remove all non-digits from the card number entered by the customer.

This can be very useful to prove in a security audit that you’re not improperly exposing your clients’ financial details. You can use a slightly different regular expression to find credit card numbers, or number sequences that might be credit card numbers, within larger documents. Each card issuer has its own range of card numbers, identified by the first 4 digits. You can even determine the type of credit card being used. With a few simple regular expressions, you can easily verify whether your customer entered a valid credit card number on your order form.

Mastercard credit card numbers begin with