A couple of points not related to your issue with the regex.

• From a style and a code maintenance point of view, it might be better to move the closedir(TEMP); line up to immediately after the my @FILES=readdir(TEMP); line since you've done with reading the directory handle at that point.
• It is now considered good practice to use the three-argument form of open with lexical filehandles and, when testing for success as you do (well done ++), it is useful to output the O/S error $! (see perlvar).
• It is perhaps better to use Perl-style for loops rather than C-style ones. You can use for and foreach interchangeably. Instead of

  my $fi = scalar (@FILES);
  for (my $k = 0; $k < $fi ; $k++)
    {
       open (F,$FILES[$k]) or die " rey ledhu ra \n";
       ...
    };
  [download]

  use

  foreach my $file ( @FILES )
  {
      open my $inFH, '<', $file
         or die "open: < $file: $!\n";
      ...
  }
  [download]

I hope this is of interest.

Cheers,

JohnGG

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