string findintthisstring = "W/JR/Si//wqaZBW1arDXZocU8EjIAxK0XJQjlSJXNd0=8getthisval";
            Regex regex_nickname = new Regex("getthisval");
            Match match_nickname = regex_nickname.Match(findintthisstring.ToLower());
            if (match_nickname.Success)
            {
                string nick = match_nickname.Value;
                Console.WriteLine("Contains nickname");
                string all = nick;
                Console.WriteLine(all);
            }