for my $file (@files){
  my $line_no = 0;
  print "Reading $file\n";
  open my $fh, '<', $file or die $!;
  while (<$fh>){
    chomp;
    ++$line_no;
    s/ +/ /g;    # remove multiple spaces
    
    # special pcscf_v4 extract addr
    if (/($re).*addr = ([.\da-fA-F:]+)/){
      my $msg = update_sheet($1,$2,$_);
      print "Line $line_no $msg special\n"; 
      next;
    }
    
    # match more than 1 per line e.g. usim and isim   
    while (/($re)[ =]*([^,]+)/g){
      my $msg = update_sheet($1,$2,$_);
      print "Line $line_no $msg\n"; 
    }
    
  }  
  close $fh;
}

# update sheet
sub update_sheet {
  my ($kw,$value,$comment) = @_;  
  my $clean = cleanup($kw,$value);
  
  my ($sht,$r,$c) = @{$kwhashref->{$kw}}[0..2];
  my $sel = $Book->Worksheets($sht)->Cells($r,$c+1);
  $sel->Insert({ Shift => -4161}); # xlToRight
  $sel->{Value} = $clean;
  $sel->AddComment( { Text=> $comment } );
  $sel->Comment->Shape->TextFrame->{ AutoSize } = 1;

  $kwhashref->{$kw}[3] = $value; # for debugging
  $kwhashref->{$kw}[4] = $clean; # for debugging
  return "kw=[$kw] value=[$value] clean=[$clean]";
}

# remove unwanted chars from value
sub cleanup {
  my ($kw,$value) = @_;
  
  # generic cleansing
  $value =~ s/[\[\]]//g; # remove all [] brackets
  $value =~ s/^\s+//g;   # remove leading whitespace
  $value =~ s/\s+$//g;   # remove trailing whitespace
  
  # specific cleansing
  #if ($kw =~ //){
    # $value =~ s///g
  #}
  
  return $value;
}