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.

##</code><code>##

my @results = grep( /@matches/, @netstat );

##</code><code>##

my @results = grep(/invalid headers packets dropped/, @netstat);

##</code><code>##

foreach my $match (@matches) {
    my @results = grep /$match/, @results;
    print @results;
}