ASP.NET: REGEX Parse the RSS / ATOM Feed Url from a Page
2 is not equal to 3, not even for large values of 2. - Grabel's Law I've been scraping again, I confess. Just can't resist it. One of the things I've run into when grabbing a bunch of web pages in a threadpool callback is how to determine if the page sports the autodiscovery tags (e.g. there is a feed for the site). Here is one way to do this with a little bit of REGEX: using System.Text.RegularExpressions; namespace WebLogsSearcher { public static class Matcher { public static string Parse(string htmldata) { Regex linkregex = new Regex(@"<link\s*(?:(?:\b(\w-)+\b\s*(?:=\s*(?:""[^""]*""'" + @"[^']*'[^""'<> ]+)\s*)?)*)/?\s*>", RegexOptions.IgnoreCase RegexOptions.ExplicitCapture); string url = ""; foreach (Match linkmatch in linkregex.Matches(htmldata)) { bool ok = false; Regex sublinkregex = new Regex(@"(?<name>\b(\w-)+\b)\" + @"s*=\s*(""(?<...