Regex for HTML Entity

javascript

const regex = /&(?:#[0-9]+|#x[0-9a-fA-F]+|[a-zA-Z]+);/;
const isValid = regex.test(value);

python

import re
pattern = r'&(?:#[0-9]+|#x[0-9a-fA-F]+|[a-zA-Z]+);'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /&(?:#[0-9]+|#x[0-9a-fA-F]+|[a-zA-Z]+);/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/&(?:#[0-9]+|#x[0-9a-fA-F]+|[a-zA-Z]+);/', $value)) {
    echo "valid";
}

java

String pattern = "&(?:#[0-9]+|#x[0-9a-fA-F]+|[a-zA-Z]+);";
boolean isValid = value.matches(pattern);