one possible solution is (if i understood the question) : 

use strict;

my @notgood = qw(1 5 6 9);
my @goodarray = qw(1 2 3 4 5 6 7 8 9);
my @good;

foreach my $yes (@goodarray){
if (!grep{$_ == $yes}@notgood){
    push @good , $yes;
}
}

print "@good";

[download]
but read how grep works and you'll probably find more elegant way to do this

In reply to Re: Extract part of a list by baxy77bax
in thread Extract part of a list by quasimodem

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