If you are going to do error checking, why not do it properly? Check that all fields are present:
(my ($s, $a, $c, $r) = split /[,\t]/) < 4 and die;
or:
die if not defined $r;
(Also, you had a typo in your code: extra paren)
When's the last time you used duct tape on a duct? --Larry Wall
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