Credit Card Number

^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13})$

Matching examples

Non-matching examples

Breakdown

4[0-9]{12}(?:[0-9]{3})?

Visa (13 or 16 digits)

|5[1-5][0-9]{14}

Mastercard

|3[47][0-9]{13}

Amex

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