Validating Credit Card Numbers in Python - HackerRank solution
Solution for hackerRank problem Validating Credit Card Numbers in Python Problem : You and Fredrick are good friends. Yesterday, Fredrick received N credit cards from ABCD Bank. He wants to verify whether his credit card numbers are valid or not. You happen to be great at regex so he is asking for your help! A valid credit card from ABCD Bank has the following characteristics: ► It must start with a 4, 5 or 6. ► It must contain exactly 16 digits. ► It must only consist of digits (0-9). ► It may have digits in groups of 4, separated by one hyphen "-". ► It must NOT use any other separator like ' ' , '_', etc. ► It must NOT have 4 or more consecutive repeated digits. Examples: Valid Credit Card Numbers 4253625879615786 4424424424442444 5122-2368-7954-3214 InValid Credit Card Numbers 42536258796157867 #17 digits in card number → Invalid 4424444424442444 #Consecutive digits are repeating 4 or more times → Invalid 5122-2368-7954 - 3214 #Separato