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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 rxRTL = new Regex(@"[0-9]{4}", RegexOptions.Compiled | RegexOptions.RightToLeft);
  10. 		var rxLTR = new Regex(@"^.*([0-9]{4})", RegexOptions.Compiled);
  11. 		var rxRLTR = new Regex(@"^.*([0-9]{4})", RegexOptions.Compiled | RegexOptions.RightToLeft);
  12. 		var phrase = "Chocolatechipcookie2017!";
  13. 		Match m = null;
  14.  
  15. 		var stopwatch = new System.Diagnostics.Stopwatch();
  16. 		stopwatch.Start();
  17. 		for (int i=0; i<50000; i++) {
  18. 			m = rxRTL.Match(phrase);
  19. 		}
  20. 		stopwatch.Stop();
  21. 		Console.WriteLine("[0-9]{{4}} with RTL: Time spent: {0}; Match = {1}", stopwatch.Elapsed.TotalSeconds, m.Value);
  22.  
  23. 		var stopwatch1 = new System.Diagnostics.Stopwatch();
  24. 		stopwatch1.Start();
  25. 		for (int i=0; i<50000; i++) {
  26. 			m=rxLTR.Match(phrase);
  27. 		}
  28. 		stopwatch1.Stop();
  29. 		Console.WriteLine("^.*([0-9]{{4}}) no RTL modifier: Time spent: {0}; Match = {1}", stopwatch1.Elapsed.TotalSeconds, m.Groups[1].Value);
  30.  
  31. 		var stopwatch2 = new System.Diagnostics.Stopwatch();
  32. 		stopwatch2.Start();
  33. 		for (int i=0; i<50000; i++) {
  34. 			m=rxRLTR.Match(phrase);
  35. 		}
  36. 		stopwatch2.Stop();
  37. 		Console.WriteLine("^.*([0-9]{{4}}) with RTL modifier: Time spent: {0}; Match = {1}", stopwatch2.Elapsed.TotalSeconds, m.Groups[1].Value);
  38. 	}
  39. }
Success #stdin #stdout 0.11s 134208KB
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Standard input is empty
stdout
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[0-9]{4} with RTL: Time spent: 0.0202989; Match = 2017
^.*([0-9]{4}) no RTL modifier: Time spent: 0.0388398; Match = 2017
^.*([0-9]{4}) with RTL modifier: Time spent: 0.0236996; Match = 2017
https://ideone.com/4FP2l9
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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