Is match successful
using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string input = "this is a test"; string pattern = "is?"; Match match = Regex.Match(input, pattern); while (match.Success) { Console.WriteLine("'{0}' found in the source code at position {1}.", match.Value, match.Index); match = match.NextMatch(); } } }