So you are looking for the names of directories in dir2 that have subdirectories called dir3 and contain files called filename? Here it is: 

use strict; 
use warnings;
foreach my $element (glob "dir1/dir2/*/dir3/filename"){ 
    print "$element:  "; 
    $element =~ m!dir1/dir2/(.*)/dir3/filename!;
    print "$1\n";
}

[download]

Comment: I left the ../../ out as it would not fit my sample dir structure I had to create. Without testing it, I would still say that you do NOT need to change the regex to make it work for your situation.

In reply to Re: Q regarding glob by hdb
in thread Q regarding glob by arunagiri

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