Answered: ou and Fredrick are good friends.…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

You and Fredrick are good friends. Yesterday, Fredrick received 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 ,  or .
► It must contain exactly  digits.
► It must only consist of digits (-).
► It may have digits in groups of , separated by one hyphen "-".
► It must NOT use any other separator like ' ' , '_', etc.
► It must NOT have  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 #Separators other than '-' are used → Invalid 44244x4424442444 #Contains non digit characters → Invalid 0525362587961578 #Doesn't start with 4, 5 or 6 → Invalid

Input Format

The first line of input contains an integer .
The next lines contain credit card numbers.

Constraints

Output Format

Print 'Valid' if the credit card number is valid. Otherwise, print 'Invalid'. Do not print the quotes.

Sample Input

6 4123456789123456 5123-4567-8912-3456 61234-567-8912-3456 4123356789123456 5133-3367-8912-3456 5123 - 3567 - 8912 - 3456

Sample Output

Valid Valid Invalid Valid Invalid Invalid

Explanation

4123456789123456 : Valid
5123-4567-8912-3456 : Valid
61234--8912-3456 : Invalid, because the card number is not divided into equal groups of .
4123356789123456 : Valid
51-67-8912-3456 : Invalid, consecutive digits is repeating times.
5123456789123456 : Invalid, because space ' ' and - are used as separators.

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