title: date matching using python regex
body: <p>What am i doing wrong in the below regular expression matching </p>
  
  <pre><code>&gt;&gt;&gt; import re
  &gt;&gt;&gt; d="30-12-2001"
  &gt;&gt;&gt; re.findall(r"\b[1-31][/-:][1-12][/-:][1981-2011]\b",d)
  []
  </code></pre>