title: grep - match word and nothing after it
body: <p>I have a file in the following format (thousands of lines &amp; tab delimited):</p>
  
  <pre><code>Gnl3l   3'UTR    
  Smap1   5'UTR||3'UTR    
  D4Wsu53e    CDS||5'UTR||3'UTR    
  Mecp2   3'UTR    
  Mecp2   3'UTR
  </code></pre>
  
  <p>I want to return all lines that contain ONLY <code>"3'UTR"</code> from the second tab. Desired output:</p>
  
  <pre><code>Gnl3l   3'UTR    
  Mecp2   3'UTR    
  Mecp2   3'UTR
  </code></pre>
  
  <p>Any thoughts on a <code>grep</code>/regex to do this?</p>