^((4\d{3})|(5[1-5]\d{2})|(6011)|(34\d{1})|(37\d{1}))-?\d{4}-?\d{4}-?\d{4}|3[4,7][\d\s-]{15}$
The regular expression above validates all credit card number such as Visa, Master Card, American Express and Discovery.
Used in ASP.NET Regular Expression Validator:
L.
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