#!/usr/bin/perl
#
# variant from Cookbook
#
sub parse_csv {
  my $text = shift;
  my @new = ();
  push (@new, $+) while $text =~ m{
          "([^\"\\]*(?:\\.[^\"\\]*)*)",?
          | ([^,]+),?
          | ,
      }gx;
  push (@new, undef) if substr($text, -1, 1) eq ",";
  return @new;
}
#
# second variant from Cookbook
# (not interesting - nothing to optimize) ;-)
#
sub parse_csv2 {
  use Text::ParseWords;
  return quotewords(",",0,$_[0]);  
}
#
# my variant
#
sub parse_csv3 {
  local $_ = $_[0];
  s/\"(.*?)(?<!\\)\",?|([^,]+),?|(?<=,),?/push @res,"$1$2"/ge;
  return @res;
}
#
# Tests
#
$line = q<XYZZY,"","O'Reilly, Inc",,,"Wall, Larry","a \"glug\" bit,",5,"Error, Core Dumped">;
@fields = parse_csv3($line);
for ($i = 0; $i < @fields; $i++) {
  print "$i : $fields[$i]\n";
}