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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. public class Test
  5. {
  6.     const string Str = "30-Nov-2012 30-Nov-2012 United Kingdom, 31-Oct-2012 31-Oct-2012 United Arab Emirates, 29-Oct-2012 31-Oct-2012 India";
  7.     static readonly Regex r1 = new Regex("(\\d{4})\\s");
  8. 	static readonly Regex r2 = new Regex("(?<=\\d{4})\\s");
  9.     static void TestRegex(Regex r, string s) {
  10.         DateTime start = DateTime.Now;
  11.         for (var i = 0 ; i != 10000 ; i++) {
  12.             r.Replace(Str, s);
  13.         }
  14.         Console.WriteLine(DateTime.Now-start);
  15.     }
  16.     public static void Main()
  17. 	{
  18. 		TestRegex(r1, "$1@");
  19.     	TestRegex(r2, "@");
  20.     	TestRegex(r1, "$1@");
  21.     	TestRegex(r2, "@");
  22.     	TestRegex(r1, "$1@");
  23.     	TestRegex(r2, "@");
  24.     	TestRegex(r1, "$1@");
  25.     	TestRegex(r2, "@");
  26. 	}
  27. }
Success #stdin #stdout 4.22s 38480KB
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stdin
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Standard input is empty
stdout
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00:00:00.4947740
00:00:00.5747460
00:00:00.4655460
00:00:00.5732990
00:00:00.4668440
00:00:00.5710920
00:00:00.4658700
00:00:00.5737650
https://ideone.com/vafueM
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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