使用 C# 解析 HTML 页面时遇到问题

Question

我一直在尝试使用 HtmlAgilityPack、Fizzler 和正则表达式来完成一些事情，但没有成功。

我试图抓取并解析为元素的页面在这里 http://www.sczg.unizg.hr/student-servis/vijest/2015-04-14-poslovi-u-administraciji/

Example of an item in item list:
<p> 
  <b>1628/ SomeBoldedTitle
  </b> 
    Some Description. 
    Some price 20,00kuna. 
  <strong>Contact somenumber
       098/1234-567 some mail
  </strong> 
</p>

我想将此项目解析为：

• 4/5 位 ID >1628/ 在 b 元素中
• 标题>b>元素中的SomeBoldedTitle
• 说明>在/b之后
• 联系电话和链接>有时在strong>元素有时在b中

这是我试图至少获得一些输出的一些代码，我希望所有 p 元素都带有 b，但没有任何结果。

 using System;
    using HtmlAgilityPack;
    using Fizzler.Systems.HtmlAgilityPack;

namespace Sample
{
    class Program
    {

        static void Main(string[] args)
        {
            var web = new HtmlWeb();
            var document = web.Load("http://www.sczg.unizg.hr/student-servis/vijest/2015-04-14-poslovi-u-administraciji/");
            var page = document.DocumentNode;
                foreach (var item in page.QuerySelectorAll("p.item"))
            {
                Console.WriteLine(item.QuerySelector("p:has(b)").InnerHtml);
            }
        }
    }
}

这是我用来获取此代码的 fizzler“文档”的链接 https://fizzlerex.codeplex.com/

Answer 1

转发

我建议使用 HTML 解析模块，因为 HTML 可能会导致一些疯狂的边缘情况，这会真正扭曲您的数据。但是，如果您可以控制您的源文本并且仍然希望/需要使用正则表达式，我会提供这种可能的解决方案。

说明

鉴于以下文字

Example of an item in item list:
<p> 
  <b>1628/ SomeBoldedTitle
  </b> 
    Some Description. 
    Some price 20,00kuna. 
  <strong>Contact somenumber
       098/1234-567 some mail
  </strong> 
</p>

这个正则表达式

<p>(?:(?!<p>).)*<b>([0-9]+)/\s*((?:(?!</b>).)*?)\s*</b>\s*((?:(?!<strong>|<b>).)*?)\s*<(?:strong|b)>\s*((?:(?!</).)*?)\s*</

会将您的文本解析为以下捕获组：

• 第 0 组将是字符串的大部分
• 第 1 组将是多位代码
• 第 2 组将是标题
• 第 3 组将是描述
• 第 4 组将是电话号码

捕获组

[0][0] = <p> 
  <b>1628/ SomeBoldedTitle
  </b> 
    Some Description. 
    Some price 20,00kuna. 
  <strong>Contact somenumber
       098/1234-567 some mail
  </
[0][1] = 1628
[0][2] = SomeBoldedTitle
[0][3] = Some Description. 
    Some price 20,00kuna.
[0][4] = Contact somenumber
       098/1234-567 some mail

解释

注意：右击图片并选择在新窗口中查看。

NODE                     EXPLANATION
----------------------------------------------------------------------
  <p>                      '<p>'
----------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
----------------------------------------------------------------------
    (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
      <p>                      '<p>'
----------------------------------------------------------------------
    )                        end of look-ahead
----------------------------------------------------------------------
    .                        any character
----------------------------------------------------------------------
  )*                       end of grouping
----------------------------------------------------------------------
  <b>                      '<b>'
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    [0-9]+                   any character of: '0' to '9' (1 or more
                             times (matching the most amount
                             possible))
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
  /                        '/'
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  (                        group and capture to \2:
----------------------------------------------------------------------
    (?:                      group, but do not capture (0 or more
                             times (matching the least amount
                             possible)):
----------------------------------------------------------------------
      (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
        </b>                     '</b>'
----------------------------------------------------------------------
      )                        end of look-ahead
----------------------------------------------------------------------
      .                        any character
----------------------------------------------------------------------
    )*?                      end of grouping
----------------------------------------------------------------------
  )                        end of \2
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  </b>                     '</b>'
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  (                        group and capture to \3:
----------------------------------------------------------------------
    (?:                      group, but do not capture (0 or more
                             times (matching the least amount
                             possible)):
----------------------------------------------------------------------
      (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
        <strong>                 '<strong>'
----------------------------------------------------------------------
       |                        OR
----------------------------------------------------------------------
        <b>                      '<b>'
----------------------------------------------------------------------
      )                        end of look-ahead
----------------------------------------------------------------------
      .                        any character
----------------------------------------------------------------------
    )*?                      end of grouping
----------------------------------------------------------------------
  )                        end of \3
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  <                        '<'
----------------------------------------------------------------------
  (?:                      group, but do not capture:
----------------------------------------------------------------------
    strong                   'strong'
----------------------------------------------------------------------
   |                        OR
----------------------------------------------------------------------
    b                        'b'
----------------------------------------------------------------------
  )                        end of grouping
----------------------------------------------------------------------
  >                        '>'
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  (                        group and capture to \4:
----------------------------------------------------------------------
    (?:                      group, but do not capture (0 or more
                             times (matching the least amount
                             possible)):
----------------------------------------------------------------------
      (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
        </                       '</'
----------------------------------------------------------------------
      )                        end of look-ahead
----------------------------------------------------------------------
      .                        any character
----------------------------------------------------------------------
    )*?                      end of grouping
----------------------------------------------------------------------
  )                        end of \4
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  </                       '</'