beep when the content of a web page matches a regular expression in csharp

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

class Program
{
    static void Main(string[] args)
    {
        // Define the URL of the web page to scrape
        string url = "https://www.example.com";

        // Define the regular expression to match
        string pattern = "example";

        // Create a web client and download the contents of the web page
        WebClient client = new WebClient();
        string html = client.DownloadString(url);

        // Load the HTML document using the HtmlAgilityPack
        HtmlDocument doc = new HtmlDocument();
        doc.LoadHtml(html);

        // Find all text nodes in the HTML document
        foreach (var node in doc.DocumentNode.DescendantsAndSelf())
        {
            if (!node.HasChildNodes && !string.IsNullOrWhiteSpace(node.InnerText))
            {
                // Check if the text node matches the regular expression
                if (Regex.IsMatch(node.InnerText, pattern))
                {
                    // Beep to alert the user of the match
                    Console.Beep();
                    Console.WriteLine("Match found!");
                    break; // Stop searching after first match is found
                }
            }
        }
    }
}
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