#!/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;
}