title: Locating elements without a specific class name
body: <p>This is in the same vein as this question I asked before - <a href="https://stackoverflow.com/q/37492341/4190664">Watir webdriver; counting elements with changing class names</a>. I was able to add the specific number of elements based on using the class name <code>asset-card selectable</code>.</p>
  
  <p>Currently, I am looking to click on more elements to <em>add</em> them to the existing set.  Here is my dilemma:</p>
  
  <ul>
  <li>When an element <em>is not</em> clicked, the class name is: <br/> <code>image-card asset-card selectable</code></li>
  <li>When an element is clicked, <code>selected</code> is appended to the class name: <br/> <code>image-card asset-card selectable selected</code></li>
  </ul>
  
  <p>In my case, I am trying to look for additional elements that <em>only</em> say <code>image-card asset-card selectable</code> and do not include <code>selected</code>. I am not sure how to explicitly locate them.</p>
  
  <p>Is there a regex solution or any other thoughts on how to approach this?</p>