The RegularExpressionValidator allows validating the input text by matching against a pattern against a regular expression. The regular expression is set in the ValidationExpression property.
Example:-
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Email Validate</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblEmail"
Text="Email Address:"
AssociatedControlID="txtEmail"
Runat="server" />
<asp:TextBox
id="txtEmail"
Runat="server" />
<asp:RegularExpressionValidator
id="regEmail"
ControlToValidate="txtEmail"
Text="(Invalid email)"
ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
Runat="server" ForeColor="#FF0066" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html>
Example:-
default.aspx:-
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Email Validate</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblEmail"
Text="Email Address:"
AssociatedControlID="txtEmail"
Runat="server" />
<asp:TextBox
id="txtEmail"
Runat="server" />
<asp:RegularExpressionValidator
id="regEmail"
ControlToValidate="txtEmail"
Text="(Invalid email)"
ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
Runat="server" ForeColor="#FF0066" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html>
Output:
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