As a further supplement to trippledubs post, here's a small script you can play around with:

use strict;
use warnings;

my %h = (foo => 'oxen');
my $d = \%h;

print test_it(), "\n";

sub test_it {
  return 1 if ( $d->{foo} && $d->{foo} =~ /X/i );
  return 0;
}
[download]

As trippledubs touched on, if the second condition is met then the fist condition will also inevitably be met. Hence, the script will function perfectly well if the first condition is omitted - except that it would then also print a warning if $h{foo} is not defined.

Cheers,
Rob