In scalar context, the range operator yields true or false. So comparing $i == (5..10) does not make sense. The code you want is:

  for $i (@arr) {
    if ($i==5 .. $i==10) {
      print "$i\n";
    }
  }
[download]

Or:

  for $i (@arr) {
    print "$i\n" if $i==5 .. $i==10;
  }
[download]

--
Mark Dominus
Perl Paraphernalia