And now for something completely different... 

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11127703
use warnings;
no warnings qw( qw );
use Search::Dict;

@ARGV = qw( 1,2,5,6,9,10,41-56 1 4 42 17 );

my $file = join '', map "$_\n", split /,/, shift;
open my $fh, '<', \$file or die;

for my $n ( @ARGV )
  {
  look $fh, $n, {
    comp => sub { $_[0] <=> $_[1] },
    xfrm => sub { $_[0] =~ s/\d+-//r },
    };
  my $have = <$fh>;
  my $not = (defined $have and
    $have =~ /(\d+)-(\d+)/ ? $1 <= $n <= $2 : $have == $n) ? '' : ' no
+t';
  print "$n is$not in set\n";
  }

[download]

Outputs: 

1 is in set
4 is not in set
42 is in set
17 is not in set

[download]

In reply to Re: Comparing a value to a list of numbers by tybalt89
in thread Comparing a value to a list of numbers by g_speran

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