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<%@ Page Language="C#" %>
<!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>Regular Expression Tester</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Phone Number:<br />
<asp:TextBox ID="txtPhone" runat="server"></asp:TextBox>
<asp:RegularExpressionValidator
ID="regPhone"
runat="server"
ControlToValidate="txtPhone"
ValidationExpression="^(\(?\s*\d{3}\s*[\)\-\.]?\s*)?[2-9]\d{2}\s*[\-\.]\s*\d{4}$"
Text="Enter a valid phone number" />
<asp:Button ID="btnSubmit"
Text="Click this to test validation"
runat="server" />
</div>
</form>
</body>
</html>
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