A regex that matches all credit cards

by Yugolancer

Posted on Wednesday, January 26, 2011

This is a regular expression that validates all credit card numbers including VISA, MASTER, AMEX and DISCOVERY! ^((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}$

 

< asp:regularexpressionvalidator id="CreditCardValidator" runat="server" controltovalidate="CreditCardNumber" display="Static" errormessage="Please enter valid card number" validationexpression="^((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}$" validationgroup="CustomSignup" text="*" />