Debugging Challenge

Just a regular expression (F#)

Previously on Dr. Lambda’s blog: I have devised a series of debugging challenges, some are easy, some are really hard, all come from real live systems. Good luck!

The Challenge

• 1 point if you can spot where the error is.
• +1 point if you can explain why.
• +2 points if you can explain how to fix it.

let csv_split seperator str =
  let csvSplit = new Regex(
    "((?:\")[^\"]*(?:\"(?=,|$)+)|(?<=,|^)[^,\"]*(?=,|$))", 
    RegexOptions.Compiled) in
  csvSplit.Matches(str)
    .OfType<Match>()
    .Select(fun m -> m.Value.TrimStart(','))
    .ToArray()