- using System; 
- using System.Text.RegularExpressions; 
-   
- public class Test 
- { 
- 	public static void Main() 
- 	{ 
- 		var input = "35afe06d-8393-4559-b6d7-74d35ce131d8|Master"; 
-         var pattern = @"([a-f0-9]+(?:-[a-f0-9]+){4})\|(\w+)"; 
-         var replacement = "http://my-server/media/guid/$1?v=$2"; 
-         var output = Regex.Replace(input, pattern, replacement); 
-         Console.WriteLine(output); 
- 	} 
- } 
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