title: search for hexadecimal number on python using re
body: <p>I am processing an html text file, and serching for hexadecimal numbers as follows:</p>
  
  <pre><code>example    \xb7\xc7\xa0....
  </code></pre>
  
  <p>I tried with this code</p>
  
  <pre><code>t=re.findall (r'\\x[0-9a-fA-F]+', line)
  </code></pre>
  
  <p>but I can only gained empty list.</p>
  
  <p>please tell the right way of writing the code.</p>