using System;

using System.Text.RegularExpressions;

using static System.Console;

​

public class Program

{

    public static void Main()

    {

        string str = "palavra 1-2-5";

        Regex rgx = new Regex(@"^[a-zA-Z0-9-]+$");

​

        bool isValid = rgx.IsMatch(str);

​

        WriteLine(isValid);

​

        //Para verificar se a string é uma Guid

​

        Guid result;

        bool isGuid = Guid.TryParse(str, out result);

​

        WriteLine(isGuid);

    }

}