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// ** DO NOT USE **
// THIS IS BAD BROKEN CODE, ONLY DISPLAYED FOR BENCHMARKING PURPOSES!
if (!tagpaired[i] && !ignoredtags.Contains(tagname))
...

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var ignoredtags = new List<String> { "p", "img", "br" };

if (!tagpaired[i] && !ignoredtags.Contains(tagname))
...

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

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