Inbuilt Regex class or Parser.How to extract text between the tags from html file ?

Answer 1

HtmlAgilityPack....

Next time - search for an answer before. This is duplicate for sure.

Little tutorial.

Answer 2

You just asked an almost identical question and deleted it. Here was the answer I gave before:

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Try the HTML Agility Pack.

Here's an example:

 HtmlDocument doc = new HtmlDocument();
 doc.Load("file.htm");
 foreach(HtmlNode link in doc.DocumentElement.SelectNodes("//a[@href"])
 {
    HtmlAttribute att = link["href"];
    att.Value = FixLink(att);
 }
 doc.Save("file.htm");

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Regarding your extra question regarding regex: do not use Regex to parse HTML. It is not a robust solution. The above library can do a much better job.