RegularExpressionValidator problem

I have a multiline textbox in my page and the following RegularExpressionValidator control:

 

<asp:RegularExpressionValidator runat="server" ID="revShortMessage" ControlToValidate="txtShortMessage" Display="Dynamic" ErrorMessage="Web site addresses are not allowed." SetFocusOnError="true" ValidationGroup="SendProfile" ValidationExpression="(\b\.+\b)|(\w+dot\w+)|(\s+\.+\s+)|(\s+dot\s+)" EnableClientScript="trueââ?¬Â /> 

 

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