- using System; 
- using System.Text.RegularExpressions; 
-   
- public class Test 
- { 
- 	public static void Main() 
- 	{ 
- 		string email = "an.email@ahost.com"; 
- 		string regex = @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"; 
-   
- 		Regex rgx = new Regex(regex); 
-   
- 		Boolean result = rgx.IsMatch(email); 
- 		System.Console.WriteLine("{0} validation is {1}", email, result.ToString()); 
- 	} 
- } 
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