use 5.18.2;
use Text::CSV; 
use Data::Peek;

my $csv = Text::CSV->new ({ sep  => ", ", quote => "'", auto_diag => 1 });

while (my $row = $csv->getline (*DATA)) {
    DDumper $row;
    }

__DATA__
(101, '1997-02-25', 'S1', 31.00, NULL, 0.00, 'this becomes two fields, so no go', 5.11),
(102, '1998-03-26', 'S1', 31.00, NULL, 0.00, 'this will remain one field', 6.11),