http://chandoo.org/wp/2009/04/07/using-credit-card-numbers-in-excel/ Fresh Excel Tips, Tricks, Charts, Tutorials, Downloads, Dashboards and Visualization Showcase for your Inspiration and Productivity Fri, 19 Mar 2010 15:13:27 -0700 http://wordpress.org/?v=2.8.5 hourly 1 http://chandoo.org/wp/2009/04/07/using-credit-card-numbers-in-excel/#comment-57263 Jeff Tue, 07 Apr 2009 13:05:20 +0000 http://chandoo.org/wp/?p=2103#comment-57263 Parsing so that it can do 16 digits is great. Now, add in extra script to validate the digits (check that the first number is a 4 or 5 - Visa vs Mastercard, 6 for Discover). :) Parsing so that it can do 16 digits is great. Now, add in extra script to validate the digits (check that the first number is a 4 or 5 – Visa vs Mastercard, 6 for Discover).

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