How to find if table cells don't contain xx
<p>I'm looking create a piece of jQuery logic that answers:</p>

<blockquote>
  <p>Are there any tables cells that don't contain '' or 'xx' and don't have the class 'yy'</p>
</blockquote>

<p>This is my effort - but it seems really messy?:</p>

<pre><code>$('td').filter(function(index) {
            return  !$(this).hasClass('yy') &amp;&amp;
                    !($(this).html().trim() == '' || $(this).html().trim() == '');
        })
</code></pre>
