Regex for Discover Credit Card

javascript

const regex = /^6(?:011|5[0-9]{2})[0-9]{12}$/;
const isValid = regex.test(value);

python

import re
pattern = r'^6(?:011|5[0-9]{2})[0-9]{12}$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^6(?:011|5[0-9]{2})[0-9]{12}$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^6(?:011|5[0-9]{2})[0-9]{12}$/', $value)) {
    echo "valid";
}

java

String pattern = "^6(?:011|5[0-9]{2})[0-9]{12}$";
boolean isValid = value.matches(pattern);