while ($output =~ m/...re.../sg) {
  ... process block ...
}

##</code><code>##

$re = qr{AMQ8409.*?QUEUE\((.*?)\).*?RQMNAME\((.*?)\).*?RNAME\((.*?)\).*?end};

##</code><code>##

while ($output =~ m/(AMQ8409.*?end)/gs) {
  my $block = $1;
  my %hash;
  while ($block =~ m{(\w+)\((.*?)\)}g) {
    $hash{$1} = $2;
  }
  # process block
  # use $hash{QUEUE}, $hash{RQMNAME}, $hash{RNAME}, etc.
}

##</code><code>##

my %hash;
while (<>) {
  if (m/^AMQ8904/) { # start of block found
    %hash = ();
  } elsif (m/end/) { # end of block found
    ... process block ...
  } else {
    $hash{QUEUE} = $1 if m/QUEUE\((.*)\)/;
    $hash{RNAME} = $1 if m/RNAME\((.*)\)/;
    # ... add more variables of interest ...
  }
}