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A comment on The anatomy of a credit card form. Parent comment

Re:The anatomy of a credit card form by stonogo on Wednesday July 15, 2015 @11:14AM (#9891692)
They most certainly do not have a singular canonical format. American Express cards use different groupings and a four-digit card security code.
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Re:The anatomy of a credit card form by abhorrence on Wednesday July 15, 2015 @12:34PM (#9892298)
At least for the US, the issuer of a credit card (and thus the format) can frequently be determined from as little as the first digit. For instance, nearly all card numbers starting with '4' are Visa.
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