using System;

using System.Net;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var uriName = "http://mateso.local:1234/test?yo=bitch";

        // HTTP/S und Konsorten entfernen

        uriName = Regex.Replace(uriName, "http://", "");

        uriName = Regex.Replace(uriName, "https://", "");

        Uri uriResult;

        bool result = Uri.TryCreate("http://" + uriName, UriKind.RelativeOrAbsolute, out uriResult) && (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);

        // Gibt aus, warum der Link nicht korrekt ist:

        //WebRequest Irequest = WebRequest.Create(uriName);

        Console.WriteLine("uri <" + uriName + "> valid?:" + result);

        Console.WriteLine("parsed: "+ uriResult);

    }

}