title: Python regex extract number from string
body: <p>I would like to extract a number from a large html file with python.
  My idea was to use regex like this:</p>
  
  <pre><code>import re
  text = 'gfgfdAAA1234ZZZuijjk'
  try:
      found = re.search('AAA(.+?)ZZZ', text).group(1)
  except AttributeError:
      found = ''
  
  found
  </code></pre>
  
  <p>But unfortunately i'm not used to regex and i fail to adapt this example to extract <code>0,54125</code> from:</p>
  
  <pre><code>(...)&lt;div class="vk_ans vk_bk"&gt;0,54125 count id&lt;/div&gt;(...)
  </code></pre>
  
  <p>Is there an other way to extract the number or could some one help me with the regex?</p>