c# regex for email address

In c# while dealing with email we need to validate email address. In order to validate email address we just check whether the email address format is correct or not. In C# we can use System.Text.RegularExpressions namesapce to match the email address for validation. In Regular Expressions namespace we have Regex class and from which .Match() method can be used to match the email address with the regular express defined using Regex class.

c# regex for email address

C# code to validate email format.

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>C# validate email format regex</title>
    <form id="form1" runat="server">
        <asp:TextBox runat="server" ID="txtemail"></asp:TextBox>
        <asp:Button runat="server" ID="Send" OnClick="Send_Click" Text="Send" />

using System;
using System.Text.RegularExpressions;
public partial class Csharpregularexpressionemail : System.Web.UI.Page
        protected void Page_Load(object sender, EventArgs e)

        protected void Send_Click(object sender, EventArgs e)
        private void ValidateEmail()
            string email = txtemail.Text;
            Regex regex = new Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$");
            Match match = regex.Match(email);
            if (match.Success)
                Response.Write(email + " is corrct");
                Response.Write(email + " is incorrct");

In above example we have specified format for email regex using constructure call of Regex class. Then we have used .Match method to match the regular express pattern for email to match. And after that we have checked if match is successfull or not.


  1. Thanks for pointing out to that idea; we had another solutions, now we just used yours - i came across that link on email-address parsing to you: http://www.regular-expressions.info/email.html

  2. Please don't propagate badly verified solutions to handling the RFC2822 spec. It incorrectly identifies valid emails as bad. Compare your regex to this: http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html