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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text.RegularExpressions;
  5.  
  6. public class Test
  7. {
  8. 	public static void Main()
  9. 	{
  10. 		var sentence = "I was watching TV last night while she was reading a book and you were playing video games";
  11. 		var result = Regex.Replace(sentence, @"\b(?:(I was)|you were)\b", m =>
  12. 			m.Groups[1].Success ? "you were" : "I was");
  13.         Console.WriteLine(result);
  14. 	}
  15. }
Success #stdin #stdout 0.07s 21080KB
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Standard input is empty
stdout
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you were watching TV last night while she was reading a book and I was playing video games
https://ideone.com/sUtvV4
language:
C# (gmcs 5.20.1)
created:
4 years ago
visibility:
secret

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