use strict;
use warnings;

my %details;

my @rules=(
  "Hardware"          => sub{$details{HARDWARE_SEEN} = 1 },
  'cisco Nexus (\S+)' => sub{return 0 unless $details{HARDWARE_SEEN};
                                $details{Chassis} = $_[0];  },
  'Intel.+?(\d+)\s*(\w{2}) of memory' 
                      => sub{
                               return 0 unless $details{HARDWARE_SEEN}
+;
                               $details{"Main Memory"} = $_[0];
                               $details{"Main Memory Unit"} = $_[1];
                         },                                

);

while (<DATA>){
   for (my $i=0;  $i < $#rules;  $i+=2){
      my $regex=qr|$rules[$i]|;
      my $action = $rules[$i+1];
      next unless m/$regex/i;
      last if $action->($1,$2,$3);
   }
}

for (sort keys %details){
  print "$_\t = $details{$_}\n";
}

__DATA__
# Sample output
# Hardware
# cisco Nexus 3048 Chassis ("48x1GE + 4x10G Supervisor")
# Intel(R) Celeron(R) CPU P450 with 3981680 kB of memory.
[download]

Chassis  = 3048
HARDWARE_SEEN    = 1
Main Memory      = 3981680
Main Memory Unit         = kB
[download]