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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. namespace RegexAABBCC
  5. {
  6.     class Program
  7.     {
  8.         static void Main(string[] args)
  9.         {
  10.             string re = @"(?:(?(1)(?!))(hell)|(?(2)(?!))(hello)|(?(3)(?!))(foo))+";
  11.  
  12.             string[] txt = {
  13.                 "foo",
  14.                 "hellhello",
  15.                 "foohellohell",
  16.                 "hellhellohell",
  17.                 "foohellohellfoo",
  18.             };
  19.  
  20.             foreach (string s in txt)
  21.             {
  22.                 Match m = Regex.Match(s, re);
  23.  
  24.                 if (m.Success == true)
  25.                 {
  26.                     Console.WriteLine("Matched:     \"{0}\" \tin: \"{1}\"", m.Value, s);
  27.                 }
  28.                 else
  29.                 {
  30.                     Console.WriteLine("Not matched: \"{0}\"", s);
  31.                 }
  32.             }
  33.  
  34.             Console.ReadKey();
  35.         }
  36.     }
  37. }
Success #stdin #stdout 0.07s 34072KB
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stdin
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Standard input is empty
stdout
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Matched:     "foo" 	in: "foo"
Matched:     "hellhello" 	in: "hellhello"
Matched:     "foohell" 	in: "foohellohell"
Matched:     "hellhello" 	in: "hellhellohell"
Matched:     "foohell" 	in: "foohellohellfoo"
https://ideone.com/kIOiwy
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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