in reply to can understand one line of code

It's quite obscurely written, but, it's roughly equivalent to:

my @results;
my @tmp_array    = @{ $RegObj->{SUBKEYS} };
$RegObj->{MEMBERS} = \@tmp_array;

for my $member (@{ $RegObj->{MEMBERS} })
{
  next unless $member =~ /\$/;
  $member =~ s/\$/$RegObj->{DELIM}/;
  push @results, $member;
}

@results;

[download]
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In Section Seekers of Perl Wisdom