title: Regular expression to match CSV delimiters
body: <p>I'm trying to create a PCRE that will match only the commas used as delimiters in a line from a CSV file. Assuming the format of a line is this:</p>
  
  <pre><code>1,"abcd",2,"de,fg",3,"hijk"
  </code></pre>
  
  <p>I want to match all of the commas except for the one between the 'e' and 'f'. Alternatively, matching just that one is acceptable, if that is the easier or more sensible solution. I have the sense that I need to use a negative lookahead assertion to handle this, but I'm finding it a bit too difficult to figure out.</p>