Using the Luhn algorithm to validate credit cards

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Using the Luhn algorithm to validate credit cards

published 1 year, 2 months ago, submitted by

SuperJason 1 year, 2 months ago

ytechie.com — The right way to do credit card validation with the Luhn algorithm. Just as easy as regular expressions, but with stronger validation. This is a step-by-step guide to get it working in 10 minutes or less.

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Using the Luhn algorithm to validate credit cards

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Here is a VB.NET version of the Luhn algorithm (back when I had to code in VB.NET)...

http://www.dotnetkicks.com/vbnet/Credit_Card_Number_Validation_VB_Net_Function

posted by

powerrush 1 year, 2 months ago

Thanks for giving me credit since you the post was inspired by my comment and not the post.

posted by

jdelator 1 year, 2 months ago

It should read *since you know

posted by

jdelator 1 year, 2 months ago

Well really the best way to do it is with both regex and Luhn validation. Also, the fastest way to add up digits in a number is to use modulus-9, not to convert to a string then walking the chars converting them as you go...

posted by gregbeech 1 year, 2 months ago