title: Postgresql -- cleanup HTML tags in middle of string
body: <p>If I have this in a Postgresql 9.1 column:</p>
  
  <pre><code>foo foo &lt;th id="ddd"&gt; foo foo &lt;th id="www"&gt; foo
  </code></pre>
  
  <p>And I want it to update to this:</p>
  
  <pre><code>foo foo &lt;th&gt; foo foo &lt;th&gt; foo
  </code></pre>
  
  <p>I've tried regex_replace, but I have not succeeded.</p>