1
2
3
4

private static Regex _namedtags = new Regex
    (@"</?(?<tagname>\w+)[^>]*(\s|$|>)",
    RegexOptions.Singleline | RegexOptions.ExplicitCapture);
...

1
2
3
4

private static Regex _tags = new Regex("<[^>]*(>|$)", RegexOptions.Singleline | RegexOptions.ExplicitCapture | RegexOptions.Compiled);
private static Regex _whitelist = new Regex(@"
    ^</?(a|b(lockquote)?|code|em|h(1|2|3)|i|li|ol|p(re)?|s(ub|up|trong|trike)?|ul)>$
...