• Do not use parse (), use getline ()
• Use a lexical file handle
• Never use an else branch if the if branch ends the enclosing scope (exit, return, die, last, …)
• Use auto_diag
• Use positive logic for validation

# Use auto_diag to see all parsing errors immediately
my $csv = Text::CSV_XS->new ({ binary => 1, auto_diag => 1, allow_whit
+espace => 1 });
open my $fh, "<", $file_to_parse or die "Could not open '$file' $!";
while (my $row = $csv->getline ($fh)) {

    # Check first and third field to be numeric only (and not empty)
    $row->[0] =~ m/^[0-9]+$/ && $row->[2] =~ m/^[0-9]+$/ or
        exit;        # wrong format

    # THERE CANNOT BE AN ELSE AFTER AN EXIT !
    }
[download]

update: your sample data contains spaces. You will have to deal with those, as the current tests will fail for leading and training spaces. Adding allow_whitespace option to the constructor will help you here.

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