Addressing the immediate problem, I would say that you have no array called @fields and therefore cannot access the seventh element of it.

Delving further, I am confused as to what you are doing. For one, you assign $komp_dir the directory and then never use it. (However, I assume there is more to the program.) Continuing on, let me translate your code to English to see if that is what you want.

foreach $file in @directory {
    if the $file is a directory {
        assign an implicit split to @_ (deprecated) to $file; # hmmm
        assign the seventh element of @fields to $file and match a reg
+ex; # hmmm
        print the capture from the previous regex;
        explicitly go to the next element;
    }
}
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I think you want my @path = split(/\//, $komp_dir) instead of your split. I do not really know what you want for the other hmmm'd line. Assuming you want what shmen had written, a simple rindex will suffice. (And you can condense the if statement to one line!) you can use File::Basename:

use File::Basename;
my $fname = basename($path);
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Update: added three final sentences after reading shemn's post.

Update: rindex method is not so simple, added easier method.