function getHostName(url) {
            // scheme : // [username [: password] @] hostname [: port] [/ [path] [? query] [# fragment]]
    var e = new RegExp('^(?:(?:https?|ftp):)/*(?:[^@]+@)?([^:/#]+)'), matches = e.exec(url);

            return matches ? matches[1] : url;
        }


console.log(1, getHostName('https://www.example.org'));
console.log(2, getHostName('https://www.example.org?code=1234'));
console.log(3, getHostName('https://user:passwd@www.example.org?code=1234'));
console.log(4, getHostName('https://user:passwd@www.example.org/bla?code=1234'));
console.log(5, getHostName('http://www.example.org:3000/passwort-zuruecksetzen?email=email@example.com&code=844815'));
console.log(6, getHostName('http://www.example.org:3000/passwort-zuruecksetzen?email=email%40example.com&code=844815'));
console.log(7, getHostName('http://user:pass@www.example.org:3000/passwort-zuruecksetzen?email=email@example.com&code=844815'));

1 www.example.org
2 www.example.org?code=1234
3 www.example.org?code=1234
4 www.example.org
5 example.com&code=844815
6 www.example.org
7 www.example.org