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    Arrays and slices are interpolated into double-quoted
strings by joining the elements with the delimiter 
specified in the $" variable($LIST_SEPARATOR if 
"use English;" is specified), space by default.
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    my @results = grep( /@matches/, @netstat );
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    my @results = grep(/invalid headers packets dropped/, @netstat);
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    foreach my $match (@matches) {
    my @results = grep /$match/, @results;
    print @results;
}