我如何猜测Perl中的字符串的编码？

use Encode::Detect::Detector;
my $unknown = "\x{54}\x{68}\x{69}\x{73}\x{20}\x{79}\x{65}\x{61}\x{72}\x{20}".
              "\x{49}\x{20}\x{77}\x{65}\x{6E}\x{74}\x{20}\x{74}\x{6f}\x{20}".
              "\x{B1}\x{B1}\x{BE}\x{a9}\x{20}\x{50}\x{65}\x{72}\x{6c}\x{20}".
              "\x{77}\x{6f}\x{72}\x{6b}\x{73}\x{68}\x{6f}\x{70}\x{2E}";
my $encoding_name = Encode::Detect::Detector::detect($unknown);
print $encoding_name; # gb18030

use Encode;
my $String = decode($encoding_name,$unknown);

我发现编码’ascii’是摆脱非ASCII字符的跛脚解决方案。一切将被问号所取代;这太有用了。

# Bad example; don't do this.
use utf8;
use Encode;
my $String = 'This year I went to 北京 Perl workshop.';
print encode('ascii',$String); # This year I went to ?? Perl workshop.

如果你想要可读的ASCII文本，我建议使用Text::Unidecode。这也是有损编码，但不像上面的纯编码那么可怕。

use utf8;
use Text::Unidecode;
my $String = 'This year I went to 北京 Perl workshop.';
print unidecode($String); # This year I went to Bei Jing  Perl workshop.

但是，如果可以帮助它，请避免这些有损编码。如果以后要反转操作，请选择PERLQQ或XMLCREF中的任何一个。

use utf8;
use Encode qw(encode PERLQQ XMLCREF);
my $String = 'This year I went to 北京 Perl workshop.';
print encode('ascii',$String,PERLQQ);  # This year I went to \x{5317}\x{4eac} Perl workshop.
print encode('ascii',XMLCREF); # This year I went to 北京 Perl workshop.