Validation

Credit Card (Simple)

Matches major credit cards (Visa, MasterCard, Amex, Discover).

Pattern

^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|6(?:011|5[0-9]{2})[0-9]{12})$

Test Cases

4111111111111111 Match

123 No Match

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