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| // <Snippet3> | |
| using System; | |
| using System.Text.RegularExpressions; | |
| public class Class1 | |
| { | |
| public static void Main() | |
| { | |
| string pattern = @"\b(\w+?)\s\1\b"; | |
| string input = "This this is a nice day. What about this? This tastes good. I saw a a dog."; | |
| foreach (Match match in Regex.Matches(input, pattern, RegexOptions.IgnoreCase)) | |
| Console.WriteLine("{0} (duplicates '{1}') at position {2}", | |
| match.Value, match.Groups[1].Value, match.Index); | |
| } | |
| } | |
| // The example displays the following output: | |
| // This this (duplicates 'This)' at position 0 | |
| // a a (duplicates 'a)' at position 66 | |
| // </Snippet3> |