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<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>Demo by roXon </title>
</head>
<body>
  
  
  
  <table>
    <tr class="index0 tRow something">
      <td>0</td>
    </tr>
    <tr class="index1 tRow something">
     <td>1</td>
    </tr>
    <tr class="index2 tRow something">
     <td>2</td>
    </tr>
    
  </table>
  
  
</body>
</html>
 
$('tr[class^="index"]').each(function(){
  
  var classIndex = this.className.split(' ')[0].split('index')[1];
  
  alert( classIndex );
  
});
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