![]() ![]() ![]() Stripping Spaces and DashesThe 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.We’ll start with the order form. Each card issuer has its own range of card numbers, identified by the first 4 digits.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. You can even determine the type of credit card being used. Finding or Verifying Credit Card NumbersWith a few simple regular expressions, you can easily verify whether your customer entered a valid credit card number on your order form. ![]()
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December 2022
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