How do I remove all HTML tags from a string without knowing which tags are in it?

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You can use a simple regex like this:

public static string StripHTML(string input)
{
   return Regex.Replace(input, "<.*?>", String.Empty);
}

Be aware that this solution has its own flaw. See Remove HTML tags in String for more information (especially the comments of ‘Mark E. Haase’/@mehaase)

Another solution would be to use the HTML Agility Pack.
You can find an example using the library here: HTML agility pack – removing unwanted tags without removing content?

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