如何将标签中的信息放入 C# 和 HTMLAgilityPack？

Question

I want to get some info without the C# HTMLAgilityPack tag. (Example: <(a) href = "https://hashcode.co.kr"description = ""...>) I want to get the href value.)

How do I do it?

Answer 1

The HTML agility pack has quite a lot of knowledge that other solutions will lack, for example, if you do this with a regular expression it may trip over some of the oddities of HTML.

However, if you want to do it this way you can use the expression: href="(.*)"

Notes...

1. This won't work if you have href = "url"
2. This won't work if single-quotes are being used, ie href='url'
3. This won't work for a number of other possible HTML variations, no quotes, tabs rather than spaces, missing spaces, etc

Here's a C# example:

using System;
using System.Text.RegularExpressions;

class Program {
    static void Main(string[] args) {
     string pattern = @"href=""(.*)"" ";
     string input = "An extraordinary day <a href=\"https://hashcode.co.kr\" description=\"example\">dawns</a> with each new day.";
     Match m = Regex.Match(input, pattern, RegexOptions.IgnoreCase);
     if (m.Success)
         Console.WriteLine("Found '{0}' at position {1}.", m.Value, m.Index);
    }
}