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  1. using System;
  2. using System.Linq;
  3. using System.Text.RegularExpressions;
  4. using System.Diagnostics;
  5.  
  6. public class Test
  7. {
  8.     public static void Main()
  9.     {
  10.     	var sw = new Stopwatch();
  11.     	string s;
  12.     	Regex r;
  13.  
  14.     	const int n = 19;
  15.  
  16. 		Regex.Replace("any", ".", "x");
  17. 		"any".AsEnumerable();
  18.  
  19. 		sw.Restart();
  20.         s = "string";
  21.         for (int q=0; q<n; ++q) s = Regex.Replace(s, "(.)(?=.)", "$1 ");
  22.         sw.Stop();
  23.         Console.WriteLine("{0} {1}", s.GetHashCode(), sw.ElapsedMilliseconds);
  24.         GC.Collect();
  25.  
  26. 		sw.Restart();
  27.         s = "string";
  28.         r = new Regex("(.)(?=.)");
  29.         for (int q=0; q<n; ++q) s = r.Replace(s, "$1 ");
  30.         sw.Stop();
  31.         Console.WriteLine("{0} {1}", s.GetHashCode(), sw.ElapsedMilliseconds);
  32.         GC.Collect();
  33.  
  34. 		sw.Restart();
  35.         s = "string";
  36.         r = new Regex("(.)(?=.)", RegexOptions.Compiled);
  37.         for (int q=0; q<n; ++q) s = r.Replace(s, "$1 ");
  38.         sw.Stop();
  39.         Console.WriteLine("{0} {1}", s.GetHashCode(), sw.ElapsedMilliseconds);
  40.         GC.Collect();
  41.  
  42. 		sw.Restart();
  43.         s = "string";
  44.         for (int q=0; q<n; ++q) s = String.Join(" ", s.AsEnumerable());
  45.         sw.Stop();
  46.         Console.WriteLine("{0} {1}", s.GetHashCode(), sw.ElapsedMilliseconds);
  47.         GC.Collect();
  48.  
  49. 		sw.Restart();
  50.         s = "string";
  51.         for (int q=0; q<n; ++q) s = String.Join(" ", s.ToCharArray());
  52.         sw.Stop();
  53.         Console.WriteLine("{0} {1}", s.GetHashCode(), sw.ElapsedMilliseconds);
  54.         GC.Collect();
  55.     }
  56. }
Success #stdin #stdout 4.22s 134720KB
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stdin
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Standard input is empty
stdout
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455915401 1261
455915401 1261
455915401 1255
455915401 188
455915401 200
https://ideone.com/Zy0R7l
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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