Or even simpler...

#!/usr/local/bin/perl

use warnings;
use strict;

for (qw(1 5 10 a 4 0 deadbeef 357 Albuquerque)) {
    warn "Bad input $_\n" and next unless /^([1-7])$/;
    print "Good input $1\n";
}

[download]

Update: erp! Left out untainting bit. Minor edit to untaint data.

In reply to Re^2: form checking checkboxes by thundergnat
in thread form checking checkboxes by tanger

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