title: python regular expression substitute
body: <p>I need to find the value of "taxid" in a large number of strings similar to one given below. For this particular string, the 'taxid' value is '9606'. I need to discard everything else.   The "taxid" may appear anywhere in the text, but will always be followed by a ":" and then number.   </p>
  
  <pre><code>score:0.86|taxid:9606(Human)|intact:EBI-999900
  </code></pre>
  
  <p>How to write regular expression for this in python.</p>