Validate Email Address using Regular Expression Validator in ASPNet

In this article I will explain with an example, how to validate Email Address using Regular Expression Validator in ASP.Net.

The following HTML Markup consists of an ASP.Net TextBox and a Button. The TextBox has been associated with the following two ASP.Net Validators.

RegularExpressionValidator:

The RegularExpressionValidator has the following properties.

1. ControlToValidate – ID of the TextBox control to be validated.

2. ValidationExpression – The Regular Expression for validating the TextBox content. In this example, the Email Address.

3. ErrorMessage – The Error Message to be displayed when Validation fails.

RequiredFieldValidator:

The RequiredFieldValidator has the following properties.

1. ControlToValidate – ID of the Email control to be validated.

2. ErrorMessage – The Error Message to be displayed when Validation fails.

<asp:TextBox ID="txtEmail" runat="server" />

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtEmail"

ForeColor="Red" ValidationExpression="^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"

Display="Dynamic" ErrorMessage="Invalid email address" />

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtEmail"

ForeColor="Red" Display="Dynamic" ErrorMessage="Required" />

<br />

<asp:Button Text="Submit" runat="server" />

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Validate Email Address using Regular Expression Validator in ASP.Net