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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 tests = new List<string> {"<backspace>это буу<backspace>дка<backspace><backspace>ет тек<backspace>стовыыф<backspace><backspace>й ткаукц<backspace><backspace><backspace><backspace><backspace>екст",
  10. 			"Это<backspace><backspace><backspace><backspace><backspace><backspace>",
  11. 			"a<backspace><backspace><backspace>b",
  12. 			"<backspace><backspace><backspace><backspace>",
  13. 			"ab<backspace>c<backspace><backspace>d" };
  14. 		foreach(var test in tests)
  15. 			Console.WriteLine("'{0}'", Rx.backspaceRx.Replace(test, string.Empty));
  16.  
  17. 	}
  18.  
  19. 	public static class Rx
  20. 	{
  21. 		public static readonly Regex backspaceRx = new Regex(
  22. 			@"^(?:<backspace>)+          # 1+ <backspace> в начале
  23. 			   |                         # или
  24. 			   (?:
  25. 			     (?<t>(?<!<backspace).)  # Любой символ, перед которым нет <backspace 
  26. 			     |                       # или
  27. 			     (?<-t><backspace>)      # <backspace>
  28. 			   )+                        # 1 или более раз
  29. 			   (?(t)(?!))                # проверка стека группы t
  30. 			   (?:<backspace>)*          # 0+ <backspace>",
  31. 			RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);
  32. 	}
  33. }
  34.  
Success #stdin #stdout 0.04s 134720KB
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Standard input is empty
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'это будет тестовый текст'
''
'b'
''
'd'
https://ideone.com/oNCYKh
language:
C# (gmcs 5.20.1)
created:
6 years ago
visibility:
public

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