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<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:TextBox ID="txtValue" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Submit" />
<asp:RegularExpressionValidator
ControlToValidate="txtValue"
ErrorMessage="RegularExpressionValidator"
SetFocusOnError=true
ID="RegularExpressionValidator1" runat="server"
ValidationExpression="\d{5}(-\d{4})?">Please enter a valid 5 digit zip code</asp:RegularExpressionValidator>
</div>
</form>
</body>
</html>
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