my @off_pairs = split '=', $input;
my %hash;
my $lastkey = $off_pairs[0];
foreach ( 1 .. @off_pairs - 2 )
{
   my @array = split ' ', $off_pairs[ $_ ];
   my $newlastkey = pop @array;
   $hash{ $lastkey } = join ' ', @array;
   $lastkey = $newlastkey;
}
$hash{ $lastkey } = $off_pairs[-1];