GitHub - jonathanwkelly/PHP-Credit-Card-Validation-Script: Checks a card number for format, length and checkdigit (luhn algorithm)
A Comprehensive Guide to Validating and Formatting Credit Cards | by Kelvin Zhang | Hootsuite Engineering | Medium
GitHub - inacho/php-credit-card-validator: Validates popular debit and credit cards numbers against regular expressions and Luhn algorithm. Also validates the CVC and the expiration date.
![How to validate if input in input field is a valid credit card number using express-validator ? - GeeksforGeeks How to validate if input in input field is a valid credit card number using express-validator ? - GeeksforGeeks](https://media.geeksforgeeks.org/wp-content/uploads/20200804163628/Attempttosubmittheformwithinvalidcardnumbernotfollowingluhnformula.png)