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  1. using System;
  2. using System.IO;
  3. using System.Linq;
  4. using System.Text.RegularExpressions;
  5.  
  6. public class Test
  7. {
  8. 	public static void Main()
  9. 	{
  10. 		var s = "cC-Cc";
  11. 		var result = Regex.Replace(s, @"(?i)^([a-z]{2})-([a-z]{2})$", m => 
  12.     		$"{m.Groups[1].Value.ToLower()}-{m.Groups[2].Value.ToUpper()}");
  13.         Console.WriteLine(result);
  14. 	}
  15. }
Success #stdin #stdout 0.07s 19456KB
comments (?)
stdin 
Standard input is empty
stdout 
cc-CC
https://ideone.com/8hQPNT
language:
C# (gmcs 5.20.1)
created:
5 years ago
visibility:
secret

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