在Perl中提取{}之间的字符串

Question

我将下面所有这些存储在$data中。

'Berry-Berry Belgian Waffles' => {
                                                     'calories' => '900',
                                                     'price' => '$8.95',
                                                     'description' => 'Light Belgian waffles covered with an assortment of fresh berries and whipped cream'
                                                   },

我需要使用正则表达式提取'{'和'}'之间的内容。因此，结果应该如下所示:

'calories' => '900',
'price' => '$8.95',
'description' => 'Light Belgian waffles covered with an assortment of fresh berries and whipped cream'

我如何使用perl脚本实现这一点?

这是我到目前为止的脚本，它从xml文件中读取，无论是在网络上还是本地文件。

use XML::Simple;
use LWP;
use Data::Dumper;
#request path
print "Enter pathn";
my $input = <STDIN>;
my $data;
chomp $input;
print "Path : $inputn";
if ($input =~ /http/)
{
    print "This is a webpagen";
    my $ua = LWP::UserAgent->new;
my $req = HTTP::Request->new( GET => $input );
my $res = $ua->request( $req );

print Dumper (XML::Simple->new()->XMLin( $res->content ));
}
else
{
    print "This is a local pathn";
    $xml = new XML::Simple;
    $data = $xml ->XMLin($input);
    print Dumper($data);
}
print "Type in keyword to search: n";
my $inputsearch = <STDIN>;
chomp $inputsearch;
print "You typed --> $inputsearchn";
Dumper($data) =~ m/$inputsearch/;
$after = "$'";

$result = $after =~ /{...}/;
print $result;

Answer 1

好吧，说真的。请不要使用XML::Simple。即使XML::Simple说:

不鼓励在新代码中使用该模块。其他模块提供了更直接和一致的接口。

我将猜测XML的外观，并让您了解如何从中提取信息。如果您能提供一个更好的XML示例，我将进行更新。

<root>
  <item name="Berry-Berry Belgian Waffles">
    <calories>900</calories>
    <price>$8.95</price>
    <description>Light Belgian waffles covered with an assortment of fresh berries and whipped cream</description>
  </item>
</root>

你可以这样处理:

#!/usr/bin/env perl
use strict;
use warnings;
use XML::Twig;
my $twig = XML::Twig->new( 'pretty_print' => 'indented' );
$twig->parse( *DATA );
foreach my $item ( $twig -> get_xpath ( '//item' ) ) {
   print "Name: ", $item -> att('name'),"n";
   foreach my $element ( $item -> children ) {
       print $element -> tag,": ", $element -> trimmed_text,"n";
   }
}
__DATA__
<root>
  <item name="Berry-Berry Belgian Waffles">
    <calories>900</calories>
    <price>$8.95</price>
    <description>Light Belgian waffles covered with an assortment of fresh berries and whipped cream</description>
  </item>
</root>

对于XML::Twig，您可以通过att访问"属性"，通过tag访问元素名称，通过text或trimmed_text访问内容。

所以上面会打印:

Name: Berry-Berry Belgian Waffles
calories: 900
price: $8.95
description: Light Belgian waffles covered with an assortment of fresh berries and whipped cream