using System;
using System.IO;
using System.Text.RegularExpressions;

namespace Uhrenfinder
{
    class Program
    {
        static void Main(string[] args)
        {
            string path = @"C:\Users\Dennis\Desktop\Liste.txt";
            if (File.Exists(path))
            {
                StreamReader stream = new StreamReader(path);
                StreamWriter writer = File.CreateText(@"C:\Users\Dennis\Desktop\Uhrenliste.txt");
                Regex reg = new Regex(@"(Uhr|uhr|Ur|ur|Ugur|ugur)");
                string current = "";
                while (stream.Peek() >= 0)
                {
                    current = stream.ReadLine();
                    if (reg.IsMatch(current))
                    {
                        Console.WriteLine(current);
                        writer.WriteLine(current);
                    }
                }
            }
        }
    }
}