There are few ways you can condense this, here is one:

print "all in m8\n" if $var =~ /.*x.*y.*z.*/;
[download]

for (<DATA>) {
    chomp;
    print "$_: all in m8\n" if /.*x.*y.*z.*/;
}

__DATA__
foo
xoo
fyo
foz
xyo
fyz
xyz
[download]

UPDATE: Nope, that won't capture 'zyx' (and .* is awful) ... you could mangle the regex more or ... just use a lookup table:

my %hash = ( x => 1, y => 1, z => 1 );

for (<DATA>) {
    chomp;
    my $in = 0;
    my %hash = ( x => 1, y => 1, z => 1 );
    for my $x (split //, $_) {
        delete $hash{$x} and $in++;
    }
    print "$_: all in m8\n" if $in == 3;
}
[download]

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)