title: Python re.findall with * and **
body: <p>using a re.findall, is it possible to list two subsequent occurences of * in the same index of the list?</p>
  
  <p>lets say I have <code>str = "2**3 + 2*3"</code> I'd like the list to appear as</p>
  
  <pre><code>lis = re.findall('[\+\-*/()]', str)
  
  lis = [2, **, 3, +, 2, *, 3]
  </code></pre>
  
  <p>is there some regex like <code>*|**</code> ?</p>