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Return true if strIn is in valid e-mail format

using System; using System.Text.RegularExpressions; public class RegexUtilities {    public static void Main()    {       string[] emailAddresses = { "a.j@p.com", "d.j@s.p.com",                                    "j@m.p.com", "j.@s.p.com",                                    "j@p.com9" };       foreach (string emailAddress in emailAddresses)       {          if (RegexUtilities.IsValidEmail(emailAddress))             Console.WriteLine("Valid: {0}", emailAddress);          else             Console.WriteLine("Invalid: {0}", emailAddress);       }                                                }         public static bool IsValidEmail(string strIn)    {        return Regex.IsMatch(strIn, @"^([0-9a-zA-Z]([-\.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$");     } }