Efficient:

for (1,2,3..9,-12) {
   if ($i == $_) {
       print "$i is a 1, 2, 3, 4, 5, 6, 7, 8, 9, or -12\n";
       last;
   }
}
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Shorter, but less efficient:

print "$i is a 1, 2, 3, 4, 5, 6, 7, 8, 9, or -12\n" 
     if grep { $_ == $i } (1,2,3..9,-12);
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