RegularExpressionValidator?

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From: DC (dc_at_office)
Date: 02/09/04 

Date: Sun, 8 Feb 2004 21:43:22 -0500

I have this snippet:

<tr>
 <td align="left">E-mail</td>
 <td>
    <asp:TextBox id="txtEmail" runat="server"
MaxLength="100"></asp:TextBox>&nbsp;
    <asp:RegularExpressionValidator id="revEmail" runat="server"
     ErrorMessage="Enter a valid e-mail address"
ControlToValidate="txtEmail"

ValidationExpression="\b[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z0-9._%-]{2,4}\b">
    </asp:RegularExpressionValidator>
  </td>
</tr>

My question is why this regular expression is not invoked if I leave the
textbox blank?
My understanding is blank entry is not met the requirement of that regular
expression.

Am I missing something here?

- DC

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