Regex for Date DD/MM/YYYY

javascript

const regex = /^(0[1-9]|[12]\d|3[01])\\/(0[1-9]|1[0-2])\\/\d{4}$/;
const isValid = regex.test(value);

python

import re
pattern = r'^(0[1-9]|[12]\d|3[01])\/(0[1-9]|1[0-2])\/\d{4}$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^(0[1-9]|[12]\d|3[01])\/(0[1-9]|1[0-2])\/\d{4}$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^(0[1-9]|[12]\d|3[01])\\/(0[1-9]|1[0-2])\\/\d{4}$/', $value)) {
    echo "valid";
}

java

String pattern = "^(0[1-9]|[12]\\d|3[01])\\/(0[1-9]|1[0-2])\\/\\d{4}$";
boolean isValid = value.matches(pattern);