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hackerrank.com Validating Credit Card Numbers Problem Link : https://www.hackerrank.com/challenges/validating-credit-card-number/problem Difficulty : Medium Tip It's a bit difficult to solve only using regular expression Especially, 'NOT have or more consecutive repeated digits' More over, in test case 6, '-------' is given as a part of input, it should be filtered, also Check condition 1~4 by u..