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Using the Luhn algorithm to validate credit cards
published 2 months, 17 days ago, submitted by SuperJason SuperJason 2 months, 17 days 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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Comments:
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 powerrush 2 months, 17 days ago
Thanks for giving me credit since you the post was inspired by my comment and not the post.
posted by jdelator jdelator 2 months, 16 days ago
It should read *since you know
posted by jdelator jdelator 2 months, 16 days 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 2 months, 16 days ago



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