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Friday, 30 October 2015

How many numbers are on a mastercard?

Visa: ^4[0-9]{12}(?:[0-9]{3})?$ All Visa card numbers start with a 4. New cards have 16 digits. Old cards have 13. MasterCard: ^5[1-5][0-9]{14}$ All MasterCard numbers start with the numbers 51 through 55.


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