It appears that find_function($dirname) is actually called before (or after, depending on your options) the "wanted" function is called so you need to filter directories out in find_function.

If you do filter our directory names in the "preprocess" function then you'll prevent File::Find from recursing into those directories.

Update: d'oh! mixed up the function names..

#!/usr/bin/perl -w

use strict;
use Cwd;
use File::Find;

my $filespec   =  qr/\.(?:txt|pl)$/;
my $dir        =  $ARGV[0] || getcwd(); 

find( { wanted => \&find_function, preprocess => \&globber }, $dir );

sub find_function {
  return if (-d $File::Find::name);
  print $File::Find::name.$/;
}

sub globber{
  my @files;
  foreach(@_){
     push(@files, $_) if (/$filespec/ || (-d $_));
  }
  return @files;
}
[download]