title: Search for a string and duplicate it with modification in gvim
body: <p>I am trying to grep a line, modify it and add a modified copy of the line.</p>
  <p>Eg:</p>
  <pre><code>buffer (Z, A);
  </code></pre>
  <p>I want the output to be:</p>
  <pre><code>buffer (A1, A);
  buffer (Z, A1);
  </code></pre>