Regex for URL (Any Protocol)

javascript

const regex = /^(?:[a-zA-Z][a-zA-Z0-9+.-]*:\\/\\/)[^\s\/$.?#].[^\s]*$/;
const isValid = regex.test(value);

python

import re
pattern = r'^(?:[a-zA-Z][a-zA-Z0-9+.-]*:\/\/)[^\s/$.?#].[^\s]*$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^(?:[a-zA-Z][a-zA-Z0-9+.-]*:\/\/)[^\s/$.?#].[^\s]*$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^(?:[a-zA-Z][a-zA-Z0-9+.-]*:\\/\\/)[^\s\/$.?#].[^\s]*$/', $value)) {
    echo "valid";
}

java

String pattern = "^(?:[a-zA-Z][a-zA-Z0-9+.-]*:\\/\\/)[^\\s/$.?#].[^\\s]*$";
boolean isValid = value.matches(pattern);