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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text.RegularExpressions;
  5. using System.IO;
  6. using System.Text;
  7.  
  8. public class Test
  9. {
  10. 	public static void Main()
  11. 	{
  12. 		string phoneNumber = "1122"; // "1122" failed
  13.         Dictionary<string, string> subPatterns = new Dictionary<string, string>();
  14.         subPatterns[@"(?<1>\d)\k<1>(?<2>\d)\k<2>"] = "abba";
  15.         subPatterns[@"(?<1>\d)(?<2>\d)\k<2>\k<1>"] = "aabb";
  16.         string pattern = string.Join("|", subPatterns.Select(e => e.Key));
  17.  
  18.         foreach (Match m in Regex.Matches(phoneNumber, pattern))
  19.         {               
  20.             if (m.Success)
  21.             {
  22.                 Console.WriteLine("TRUE");
  23.             }               
  24.         }
  25. 	}
  26. }
Success #stdin #stdout 0.07s 28380KB
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stdin
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Standard input is empty
stdout
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TRUE
https://ideone.com/i71yWD
language:
C# (gmcs 5.20.1)
created:
3 years ago
visibility:
secret

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