title: Sublime snippet to get a Title case field mirrored as a lowercase
body: <p>I'm writing a sublimetext snippet, and I want to mirror a field, but get the mirrored field as a lowercase while the original field is in Title case.</p>
  
  <pre><code>getUser ('username', function(err, user){});
     ^^^^                            ^^^^
  </code></pre>
  
  <p><a href="http://sublimetext.info/docs/en/extensibility/snippets.html" rel="nofollow">Here</a> it says that I could use perl regex but I don't know either enough to figure out<br>
  what would be the appropriate regex to achieve this?</p>
  
  <pre><code>get${1:User}('',function(err,${1/???/g}){});
  </code></pre>