title: finding a href with a specific text in a table
body: <p>I have an html tables and I am trying to find the row that has a href tag whose text content has the word "Unsubscribe" in it. I am using lxml, python and xpath - I can find the row using this:</p>
  
  <pre><code>row_to_find = table.xpath("//tr[contains(descendant::*, 'Unsubscribe')]")[0]
  </code></pre>
  
  <p>But the above does not find this inside a href.. and the following does not work..</p>
  
  <pre><code>row_to_find = tables.xpath(".//tr/*/a[contains(text(), 'Unsubscribe')]")
  </code></pre>