Expression for Email Address validation in C#

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

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<asp:RegularExpressionValidator ValidationExpression=”^([a-zA-Z0-9_\-\+\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$” ID=”rxpEmail” runat=”server” ErrorMessage=”Email Address is not valid” ControlToValidate=”txtEmail”>

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