title: how to explode <br> <br/> <br /> tags in a string?
body: <p>i have a string with bunch of break tags.</p>
  
  <p>unfortunately they are irregular.</p>
  
  <p><code>&lt;Br&gt; &lt;BR&gt; &lt;br/&gt; &lt;BR/&gt; &lt;br /&gt;</code> etc...</p>
  
  <p>i am using nokogiri, but i dont know how to tell it to break up the string at each break tag....</p>
  
  <p>thanks.</p>