Regex for Mastercard Credit Card

javascript

const regex = /^(?:5[1-5][0-9]{14}|2(?:2(?:2[1-9]|[3-9][0-9])|[3-6][0-9]{2}|7(?:[01][0-9]|20))[0-9]{12})$/;
const isValid = regex.test(value);

python

import re
pattern = r'^(?:5[1-5][0-9]{14}|2(?:2(?:2[1-9]|[3-9][0-9])|[3-6][0-9]{2}|7(?:[01][0-9]|20))[0-9]{12})$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^(?:5[1-5][0-9]{14}|2(?:2(?:2[1-9]|[3-9][0-9])|[3-6][0-9]{2}|7(?:[01][0-9]|20))[0-9]{12})$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^(?:5[1-5][0-9]{14}|2(?:2(?:2[1-9]|[3-9][0-9])|[3-6][0-9]{2}|7(?:[01][0-9]|20))[0-9]{12})$/', $value)) {
    echo "valid";
}

java

String pattern = "^(?:5[1-5][0-9]{14}|2(?:2(?:2[1-9]|[3-9][0-9])|[3-6][0-9]{2}|7(?:[01][0-9]|20))[0-9]{12})$";
boolean isValid = value.matches(pattern);