Regex for Credit Cards: Visa, Mastercard, Amex
Match credit card numbers with regex. Patterns for Visa, Mastercard, Amex, Discover, and how to combine Luhn validation with format matching.
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Tags: developer-tools, regex, validation
Regex for Credit Cards: Validate Visa, Mastercard, Amex Patterns Credit card number validation serves a specific, narrow purpose: catching typos before an API call. Regex can verify that a number has the right prefix and length for a given card type. It cannot tell you whether the account exists, whether it has funds, or whether the transaction will succeed. For that, you call the payment processor. This article gives you working patterns for the major card types and explains the Luhn algorithm, which is the real validity check. --- Important Upfront: PCI DSS and Card Storage Before the regex patterns: if you're building anything that handles card numbers, you must understand PCI DSS (Payment Card Industry Data Security Standard). The rules are: Do not log card numbers Do not store the…
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