Perl从html文件中提取模式

Question

我有一个。html文件充满了链接，我想提取没有http://的域(所以只是链接的主机名部分，例如blah.com)列出它们并删除重复。

这就是我到目前为止所提出的-我认为问题是我试图传递$tree数据的方式

#!/usr/local/bin/perl -w
use HTML::TreeBuilder 5 -weak; # Ensure weak references in use
use URI;
  foreach my $file_name (@ARGV) {
    my $tree = HTML::TreeBuilder->new; # empty tree
    $tree->parse_file($file_name);
    my $u1 = URI->new($tree);
    print "host: ", $u1->host, "n";
    print "Hey, here's a dump of the parse tree of $file_name:n";
    # Now that we're done with it, we must destroy it.
    # $tree = $tree->delete; # Not required with weak references
  }

Answer 1

就我个人而言，我会使用Mojo::DOM，并使用URI模块来提取域:'

  use Mojo::DOM;
  use URI;
  use List::AllUtils qw/uniq/;
  my @domains = sort +uniq
    map eval { URI->new( $_->{href} )->authority } // (),
        Mojo::DOM->new( $html_code )->find("a[href]")->each;

(注:

->authority上的异常处理是因为一些URI在这里会崩溃;像mailto: s)

Answer 2

还有一个选项:

use strict;
use warnings;
use Regexp::Common qw/URI/;
use URI;
my %hosts;
while (<>) {
    $hosts{ URI->new($1)->host }++ while /$RE{URI}{-keep}/g;
}
print "$_n" for keys %hosts;

命令行用法:perl script.pl htmlFile1 [htmlFile2 ...] [>outFile]

可以向脚本发送多个html文件。最后一个可选参数将输出指向一个文件。

部分输出使用cnn.com主页作为html来源:

www.huffingtonpost.com
a.visualrevenue.com
earlystart.blogs.cnn.com
reliablesources.blogs.cnn.com
insideman.blogs.cnn.com
cnnphotos.blogs.cnn.com
cnnpresents.blogs.cnn.com
i.cdn.turner.com
www.stylelist.com
js.revsci.net
z.cdn.turner.com
www.cnn.com
...

希望这对你有帮助!