title: Not a valid selector error while porting from jQuery to Zepto
body: <p>I am trying to use Zepto in jQuery's place for vex.js plugin.  </p>
  
  <pre><code> ".vex:not(".vex-closing") .vex-content"
  </code></pre>
  
  <p>I am getting below error, while performing above selector.</p>
  
  <pre><code> error performing selector: ".vex:not(".vex-closing") .vex-content" zepto.min.js:3
   Uncaught SyntaxError: Failed to execute 'querySelectorAll' on 'Document': '.vex:not(".vex-closing") .vex-content' is not a valid selector. 
  </code></pre>
  
  <p>How can I fix this issue.</p>
  
  <p>Here is the code extracted from vex.js </p>
  
  <pre><code> getAllVexes: function() { 
      return $("." + vex.baseClassNames.vex + ":not(\"." + vex.baseClassNames.closing + "\") ." + vex.baseClassNames.content);
   }
  </code></pre>