Validate email format - RegularExpressionValidator

In in order to validate email address format we can use RegularExpressionValidator. We will see how to use RegularExpressionValidator to validate the email address format.For that we need to specify the Regular expression or regex in ValidationExpression property of the RegularExpressionValidator. Also we need to specify few other properties like ErrorMessage to display error message when email address is invalid. also we need to specify ControlToValidate property where we have to give textbox controls name in which user enters email address.

Validate email address using regular expression validator

Example to validate email address using RegularExpressionValidator

<html xmlns="">
<head runat="server">
  <title>Validate email format </title>
  <form id="form1" runat="server">
    <asp:TextBox ID="txtEmail" runat="server" />
    <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" />
    <asp:RegularExpressionValidator ID="validateEmail" runat="server" ErrorMessage="Invalid email."
      ControlToValidate="txtEmail" ValidationExpression="^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$" />

Also we need to check !Page.IsValid in event hadler of control like button or link...etc like
  protected void btnSubmit_Click(object sender, EventArgs e)
      if (!Page.IsValid)


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