title: Filtering a Sencha Touch 2 store to match field exactly with int value
body: <p>I am trying to filter a ST2 store to exactly find items with a certain id. By default ST2 filters stores using the LIKE operator and this does not work for finding exact int (id) matches. After some search I found that I need to use regex to do this but I can't figure out the correct regex. Here's my code:</p>
  
  <pre><code>var categoriesStore = Ext.getStore('categories');
  var category_id = this.config.data.catId;
  categoriesStore.filter('category_id', **regex pattern here**);
  </code></pre>
  
  <p>I have tried the following without luck:</p>
  
  <pre><code>/^category_id$/
  </code></pre>
  
  <p>and</p>
  
  <pre><code>"/^"+category_id+"$/"
  </code></pre>
  
  <p>I am sure that I'm very close.</p>