You could sweat over this regular expression, or, you could use File::Basename::dirname which is part of the base (you don't have to download it).

use strict;
use warnings;
use File::Basename;

my $folder_path = '/aboutiso/corp_gov/bod/agendas/2010';
$folder_path = dirname($folder_path);
print "folderpath: $folder_path\n";
[download]

Gives:

folderpath: /aboutiso/corp_gov/bod/agendas
[download]