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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Text.RegularExpressions;
  4. using System.Linq;
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		var str = "<backspace>это буу<backspace>дка<backspace><backspace>ет тек<backspace>стовыыф<backspace><backspace>й ткаукц<backspace><backspace><backspace><backspace><backspace>екст";
  10. 		var str2 = "Это<backspace><backspace><backspace><backspace><backspace><backspace>";
  11. 		var str3 = "a<backspace><backspace><backspace>b";
  12. 		Console.WriteLine("'{0}'", Rx.backspaceRx.Replace(str, string.Empty).Replace("<backspace>", ""));
  13. 		Console.WriteLine("'{0}'", Rx.backspaceRx.Replace(str2, string.Empty).Replace("<backspace>", ""));
  14. 		Console.WriteLine("'{0}'", Rx.backspaceRx.Replace(str3, string.Empty).Replace("<backspace>", ""));
  15. 	}
  16.  
  17. 	public static class Rx
  18. 	{
  19. 		public static readonly Regex backspaceRx = new Regex(
  20. 			"^(?:<backspace>)+|(?:<backspace>)+$|(?<t>(?<!<backspace).)+(?<-t><backspace>)+(?(t)(?!))",
  21. 			RegexOptions.Compiled | RegexOptions.Singleline);
  22. 	}
  23. }
  24.  
Success #stdin #stdout 0.03s 133824KB
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Standard input is empty
stdout
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'это будет тестовый текст'
''
'b'
https://ideone.com/DfMHKb
language:
C# (gmcs 5.20.1)
created:
6 years ago
visibility:
public

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