#!/usr/bin/perl

use strict;
use warnings;
use Data::Dumper;

my @result;

my $file = '/path/to/file';
open my $fh,"<",$file or die $!;
local $/ = "\n...\n";
while(my $entry = <$fh>){
   my $bool = 0;
   my @lines = split /\n/,$entry;
   my @aacc = grep{/^(?:AA|CC)/}@lines;
   my @temp = grep{/^(?:BB|DD|EE)/}@lines;
   if(grep{/Mercedes/}@aacc){
       push @result,\@temp;
   }
}
close $fh;

print Dumper(\@result);