Maybe you're thinking of the smart match operator?

use 5.010;
for my $frequency ( 1, 10 .. 17 ){
  print $frequency, ' ';
  if ($frequency ~~ [ 10 .. 15 ]) {print "Yes"}
  print "\n";
}
__END__
1
10 Yes
11 Yes
12 Yes
13 Yes
14 Yes
15 Yes
16
17
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