MSDocs redirect to english via tampermonkey

MSDocsRedirect.js

// ==UserScript==
// @name         MSDocs redirect to english
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       mmodrow <marc@marcamodrow.de>
// @match        https://docs.microsoft.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    if ("docs.microsoft.com" === window.location.host && window.location.pathname.toLowerCase().indexOf("/en-us/") === -1){
        var redirectIndended = confirm("Redirect to english version?");

        if (redirectIndended){
            var regex = new RegExp("(^\/)[a-zA-Z]{2}-[a-zA-Z]{2}(.*$)");
            var path = window.location.pathname.replace(regex, "$1en-us$2");
            window.location = location.protocol + "//" + window.location.host + path;
        }
    }
})();