title: Email Regular Expression Validation
body: <p>Can anyone correct the expression below to also not allow blank field?</p>
  
  <pre><code>&lt;asp:RegularExpressionValidator ID="expEmail" runat="server" ControlToValidate="txtEmail" ErrorMessage="valid email address required" ValidationExpression="^([a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]){1,70}$"&gt;&lt;/asp:RegularExpressionValidator&gt;
  </code></pre>