using System;

using System.Text.RegularExpressions;                   

public class Program

{

    public static void Main()

    {

            string regularExpression = "s[ia]mple";  

            string inputString = "Is it simple sample?";  

            Match m = Regex.Match(inputString, regularExpression);  

            Console.WriteLine("Match = " + TypeOf(m));  

            Console.WriteLine("Next match = " + m.NextMatch().ToString());

​

    }

}