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Regular expression to match an email address

//The MIT License (MIT) //http://arolibraries.codeplex.com/license using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Text.RegularExpressions; namespace AroLibraries.ExtensionMethods.Strings {     public static class StringExt     {         public static bool Ext_IsValidEmailAddress(this string s)         {             Regex regex = new Regex(@"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$");             return regex.IsMatch(s);         }     } }