title: Negative lookahead for hyphen
body: <p>I have the following line "Orig. 750-52.00 and orig. 3.99" and I want to extract orig. 3.99 from this line.<br>
  I am trying to do so using the following code</p>
  
  <pre><code>s = "Orig. 750-52.00 and orig. 3.99"
  orig = re.compile(r"(orig.\s?[\d|\.]+)(?!-)", re.IGNORECASE)
  if orig.search(s):
      print "Yes:", orig.search(s).groups()
  </code></pre>
  
  <p>Output: Yes: ('Orig. 75',)  </p>