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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. 		var inputTests = new[]
  9. 			{
  10. 				"5*-3",
  11. 				"(5--5)-3",
  12. 				"(5-------5)-3",
  13. 				"-(1-2)-3"
  14. 			};
  15.  
  16. 		foreach (var line in inputTests)
  17. 		{
  18. 			Console.WriteLine(line + "  ->  " + RemoveUnaryOperators(line));
  19. 		}
  20. 	}
  21.  
  22. 	private static Regex _regex = new Regex(@"(?<=^|[-(+*/])-(?<value>\d+|\((?:[^\(\)]|(?<open>\()|(?<-open>\)))+?(?(open)(?!))\))", RegexOptions.Compiled);
  23.  
  24. 	private static string RemoveUnaryOperators(string input)
  25.     {
  26.         var result = Regex.Replace(input ?? string.Empty, @"\s+", string.Empty);
  27.         string tmp;
  28.         do
  29.         {
  30.             tmp = result;
  31.             result = _regex.Replace(result, @"(0-${value})");
  32.         }
  33.         while (result != tmp);
  34.  
  35.         return result;
  36.     }
  37. }
Success #stdin #stdout 0.04s 134720KB
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stdin
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Standard input is empty
stdout
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5*-3  ->  5*(0-3)
(5--5)-3  ->  (5-(0-5))-3
(5-------5)-3  ->  (5-(0-(0-(0-(0-(0-(0-5)))))))-3
-(1-2)-3  ->  (0-(1-2))-3
https://ideone.com/KOFncu
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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