print all html elements of a web page that contain a phrase in csharp

main.cs
using System;
using System.Net;
using HtmlAgilityPack;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        string url = "https://example.com";
        string phrase = "hello world";

        // Fetch the HTML content of the web page
        string html;
        using (var client = new WebClient())
        {
            html = client.DownloadString(url);
        }

        // Parse the HTML content using HtmlAgilityPack
        var doc = new HtmlDocument();
        doc.LoadHtml(html);

        // Use a regular expression to search for the phrase in each HTML element
        var regex = new Regex(Regex.Escape(phrase), RegexOptions.IgnoreCase);
        foreach (var node in doc.DocumentNode.DescendantsAndSelf())
        {
            if (node.NodeType == HtmlNodeType.Element && regex.IsMatch(node.InnerText))
            {
                Console.WriteLine(node.OuterHtml);
            }
        }
    }
}
967 chars
35 lines