regex - C# How to delete XML/HTML comments with regular expression

Question

The fragment below doesn't work for me.

fragment = Regex.Replace(fragment, "<!--.*?-->", String.Empty , RegexOptions.Multiline  );

Answer 1

Change it to RegExOptions.Singleline instead and it'll work just fine. When not in Singleline mode, the dot matches any character, except newline.

Note that Singleline and Multiline are not mutually exclusive. They do two separate things. To quote MSDN:

Multiline mode. Changes the meaning of ^ and $ so they match at the beginning and end, respectively, of any line, and not just the beginning and end of the entire string.

Single-line mode. Changes the meaning of the dot (.) so it matches every character (instead of every character except ).

Other people have already suggested the HTML Agility Pack. I just felt you should have an explanation on why your Regex wouldn't work :)