You could probably do it much easier with a global match, but here's what I came up with for split:

my $a="command = adb
asd
  2t525
 command=adfaf
  adsgadg
asd
"; 
my @t = map { "command" . $_ } 
        grep { $_ ne "" } 
        split /command/, $a;

print @t;
[download]