title: How to find string in object
body: <p>I have this object:</p>
  
  <pre><code>var listRegions = { 
      "center": [ '7' ],
      "south": [ '12' ],
      "north": [ '11' ],
      "west": [ '4' ]
  };
  </code></pre>
  
  <p>Now, how can I look for value? Normally I looking for indexes, like 'center', 'north', etc. but now I need to find value, like '7', '12', etc.<br>
  How can I do this?</p>