C# - Replacing specific HTML tags using HtmlAgilityPack

Also it is generally a better idea to use an HTML parser like HtmlAgilityPack than trying to parse HTML using regular expressions. Here's how you could do it:

An example of what I want to do is replace any match of by in order to use a supported tag for text-alignment.

HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(html);
foreach (var e in doc.DocumentNode.Descendants("div"))
    e.Name = "p";
doc.Save(Console.Out);

Result: