regex - Perl：将（高）十进制 NCR 转换为 UTF-8

Answer 1

Answer 2

#!/usr/bin/perl
use strict;
use warnings;

use Test::More tests => 2;
use Encode qw{ encode decode };

my $in = '日本の鍼灸とは'; # 日本の鍼灸とは
my $out = '%E6%97%A5%E6%9C%AC%E3%81%AE%E9%8D%BC%E7%81%B8%E3%81%A8%E3%81%AF';

(my $utf = $in) =~ s/&#(.*?);/chr $1/ge;

my $r = join q(), map { sprintf '%%%2X', ord } split //, encode('utf8', $utf);
is($r, $out);

(my $s = $r) =~ s/%(..)/chr hex $1/ge;
$s = decode('utf8', $s);
$s = join q(), map '&#' . ord . ';', split //, $s;
is($s, $in);