Regex for Hex Color Code

javascript

const regex = /^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/;
const isValid = regex.test(value);

python

import re
pattern = r'^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/', $value)) {
    echo "valid";
}

java

String pattern = "^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$";
boolean isValid = value.matches(pattern);