http://www.perlmonks.org?node_id=863850


in reply to Checking contents of array against contents of a hash

Can you make the dlists hashes instead of arrays? Then you could check something like this: 

if (!grep {!exists $user_hash{$dlist_name}{$_}} @emails) {
   # flag 'all users'
}

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That would have the advantage of deduping your dlists; where with an array you probably ought to check before pushing.

In Section Seekers of Perl Wisdom