Remove HTML Tags from a String of HTML using C#

When a String contains HTML tags (may be using CKEditor) and want to display HTML string as Plain Text. You can achieve by using Regular Expression..

string noHTML = Regex.Replace(inputHTML, @"<[^>]+>|&nbsp;", "").Trim();

string noHTMLNormalised = Regex.Replace(noHTML, @"\s{2,}", " ");

Note : A Regex cannot handle all HTML documents. An iterative solution, with a for-loop, may be best in many cases: always test methods.

Alternative

    public static class HtmlRemoval
    {
        /// <summary>
        /// Remove HTML from string with Regex.
        /// </summary>
        public static string StripTagsRegex(string source)
        {
            return Regex.Replace(source, "<.*?>", string.Empty);
        }
 
        /// <summary>
        /// Compiled regular expression for performance.
        /// </summary>
        static Regex _htmlRegex = new Regex("<.*?>", RegexOptions.Compiled);
 
        /// <summary>
        /// Remove HTML from string with compiled Regex.
        /// </summary>
        public static string StripTagsRegexCompiled(string source)
        {
            return _htmlRegex.Replace(source, string.Empty);
        }
 
        /// <summary>
        /// Remove HTML tags from string using char array.
        /// </summary>
        public static string StripTagsCharArray(string source)
        {
            char[] array = new char[source.Length];
            int arrayIndex = 0;
            bool inside = false;
 
            for (int i = 0; i < source.Length; i++)
            {
                char let = source[i];
                if (let == '<')
                {
                    inside = true;
                    continue;
                }
                if (let == '>')
                {
                    inside = false;
                    continue;
                }
                if (!inside)
                {
                    array[arrayIndex] = let;
                    arrayIndex++;
                }
            }
            return new string(array, 0, arrayIndex);
        }
    }