title: Regex to pick characters outside of pair of quotes
body: <p>I would like to find a regex that will pick out all commas that fall outside quote sets. </p>
  
  <p>For example:</p>
  
  <pre><code>'foo' =&gt; 'bar',
  'foofoo' =&gt; 'bar,bar'
  </code></pre>
  
  <p>This would pick out the single comma on line 1, after <code>'bar',</code></p>
  
  <p>I don't really care about single vs double quotes.</p>
  
  <p>Has anyone got any thoughts? I feel like this should be possible with readaheads, but my regex fu is too weak. </p>