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sub compatible { 
    my ($s1, $s2) = @_; 
...
    !(($s1 | $s2)=~y/\0//); 
} 
print(compatible("_8__3__19", "48_____7_") ? "true\n" : "false\n");

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sub compatible {
    y/_/\477/c, y/_/\0/ for my @m = @_;
...
        for [ qw[ _8__3__19 48____7__ ] ],  # compat
                [ qw[ _8__3__19 4_8___7__ ] ],  # compat
                [ qw[ _8__3__19 48_____7_ ] ];  # clash