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Use regular expression to check email format

//GNU General Public License version 2 (GPLv2) //http://4mvcblog.codeplex.com/license // using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Text.RegularExpressions; namespace _4mvcBlog.Core {     public static class StringExtensions     {         private static readonly Regex EmailExpression = new Regex(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$", RegexOptions.Compiled | RegexOptions.Singleline);         public static bool IsEmail(this string s)         {             if (string.IsNullOrEmpty(s))             {                 return false;             }             else             {                 return EmailExpression.IsMatch(s);             }         }     } }