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Copy and paste code below to test (validator highlighted in red)
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ValidateDomainName.aspx.cs" Inherits="WebApplication1.ValidateDomainName" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1"
ErrorMessage="Ensure Login ID is in the following format: DomainName\LoginName"
ValidationExpression="(DOMAINName|domainName|domainname)\\\w+$"></asp:RegularExpressionValidator>
</div>
</form>
</body>
</html>
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