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Define a regular expression for repeated words

using System; using System.Text.RegularExpressions; public class Test {     public static void Main ()     {         Regex rx = new Regex(@"\b(?<word>\w+)\s+(\k<word>)\b",RegexOptions.Compiled | RegexOptions.IgnoreCase);         string text = "this is is a test.";         MatchCollection matches = rx.Matches(text);         Console.WriteLine("{0} matches found in:\n   {1}", matches.Count, text);         foreach (Match match in matches)         {             GroupCollection groups = match.Groups;             Console.WriteLine("'{0}' repeated at positions {1} and {2}",                                 groups["word"].Value,                                groups[0].Index,                                groups[1].Index);         }     } }