title: Regular expression in sed to replace C++ includes
body: <p>I'm trying to play with sed, to change all;</p>
  
  <pre><code>#include "X"
  </code></pre>
  
  <p>to:</p>
  
  <pre><code>#include &lt;X&gt;
  </code></pre>
  
  <p>However I can't seem to find a way to do this! - This is what I've done so far:</p>
  
  <pre><code>sed -i 's/#include ".*"/#include &lt;.*&gt;/g' filename
  </code></pre>
  
  <p>I think I'm in need of a variable to save the contains of ".*", i'm just unaware of how!</p>