title: jquery validator plugin field name with special characters
body: <p>Does anyone know how to get jQuery's validator plugin to recognize input field names with special characters?</p>
  
  <p>I have a framework that is generating a form field with these characters: [].  Example: </p>
  
  <p><code>&lt;input type="text" name="user[firstname]" id="user-firstname" /&gt;</code></p>
  
  <p>When using Jorn's plugin, the field is disregarded.</p>
  
  <p><code>rules: { user[firstname]: "required"}</code>
  is not recognized.</p>
  
  <p>But, if I remove the [] from the field name and change the requirement accordingly, no problem.</p>
  
  <p>Anyone know how to escape the square brackets?</p>
  
  <p>Thanks!</p>