Regex for ISO 8601 Duration

javascript

const regex = /^P(?!$)(?:\d+Y)?(?:\d+M)?(?:\d+W)?(?:\d+D)?(?:T(?!$)(?:\d+H)?(?:\d+M)?(?:\d+(?:\.\d+)?S)?)?$/;
const isValid = regex.test(value);

python

import re
pattern = r'^P(?!$)(?:\d+Y)?(?:\d+M)?(?:\d+W)?(?:\d+D)?(?:T(?!$)(?:\d+H)?(?:\d+M)?(?:\d+(?:\.\d+)?S)?)?$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^P(?!$)(?:\d+Y)?(?:\d+M)?(?:\d+W)?(?:\d+D)?(?:T(?!$)(?:\d+H)?(?:\d+M)?(?:\d+(?:\.\d+)?S)?)?$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^P(?!$)(?:\d+Y)?(?:\d+M)?(?:\d+W)?(?:\d+D)?(?:T(?!$)(?:\d+H)?(?:\d+M)?(?:\d+(?:\.\d+)?S)?)?$/', $value)) {
    echo "valid";
}

java

String pattern = "^P(?!$)(?:\\d+Y)?(?:\\d+M)?(?:\\d+W)?(?:\\d+D)?(?:T(?!$)(?:\\d+H)?(?:\\d+M)?(?:\\d+(?:\\.\\d+)?S)?)?$";
boolean isValid = value.matches(pattern);