title: How to search and replace an unprintable character
body: <p>I've a file that was exported from Word and it replaced all quotes with strange unicode characters which aren't correctly displayed in vim. 
  So now I want those characters to be replaced with quotes, but I don't know how to enter this character in </p>
  
  <pre><code>:%s/???/'/g
  </code></pre>
  
  <p>The characters look like this: ~U  ~R. But of course I can't just mark them with mouse and paste in the command.</p>