PL脚本替换文本

Question

我正在用这段代码来分析Java并在Java上做同样的事情。 我已经在网上搜索该代码的作用，但我不知道。

有人可以帮助我吗？

  my $line = shift;
  my $tamanho = shift;

  my $nline = NFD($line);
  $nline =~ s/[^[:print:]+]//g;
  $nline =~ s/[\x7F-\xFF]+//g;
  $nline =~ s/([^[:ascii:]]+)/unidecode($1)/ge;
  $nline =~ s/[\x00]//g;
  $nline =~ s/^\s+|\s+$//g;
  $nline .= (" " x ($tamanho - length($nline)));
  $line =~ s/^\s+|\s+$//g;
  $line .= (" " x ($tamanho - length($line)));
  if ($line ne $nline) {
     print "\n$.\n";
     print "ERA ==> $line\n";
     print "NOV ==> $nline\n";
  }

感谢和问候！