title: How to grep and exclude "nn/nn" matches
body: <p>I have the following example data (from the output of 'command'):</p>
  <pre><code>field1   field2   1/1   field4
  field1   field2   2/2   field4
  field1   field2   10/10   field4
  field1   field2   5/7   field4
  </code></pre>
  <p>I'd like to only display the lines where the first number does not match the second number in field3.</p>
  <p>I have this grep command which works fine when the numbers are a single digits:</p>
  <pre><code>command | grep -Pv '\s+([1-9]+)\/\1\s+'
  </code></pre>
  <p>So when I use the grep above with the example data, I get the following displayed:</p>
  <pre><code>field1   field2   10/10   field4
  field1   field2   5/7   field4
  </code></pre>
  <p>Ideally I want the line with 10/10 also matched and excluded.</p>
  <p>Any ideas?</p>
  <p>Cheers</p>