title: Multiple Backreferences in Matcher.replaceAll()
body: <p><code>Matcher.replaceAll()</code> with a <strong>single</strong> <a href="http://www.regular-expressions.info/java.html" rel="nofollow">backreference</a> works great (i.e. <code>Matcher.replaceAll("$2")</code>).</p>
  
  <p>But I haven't been able to make it work with two or more backreferences, e.g. <code>Matcher.replaceAll("$1$2")</code>.</p>
  
  <p>Does <code>Matcher.replaceAll()</code> support multiple backreferences at all? If so, what is the proper syntax to use it?</p>