WikiFunctions.Parse.Parsers.BoldTitle C# (CSharp) Method

        public string BoldTitle(string articleText, string articleTitle, out bool noChange)
        {
            noChange = true;
            List<string> alltemplates = GetAllTemplates(articleText);

            // don't apply in exception cases: (<section> used to transclude text in other articles so self link is valid use case)
            if (TemplateExists(alltemplates, NoBoldTitle) || articleText.Contains("<section"))
                return articleText;

            HideText Hider2 = new HideText(), Hider3 = new HideText(true, true, true);

            // 1) clean up bolded self links first, provided no noinclude use in article
            string afterSelfLinks = BoldedSelfLinks(articleTitle, articleText);

            if (!afterSelfLinks.Equals(articleText) && !WikiRegexes.IncludeonlyNoinclude.IsMatch(articleText))
                articleText = afterSelfLinks;

            // 2) Clean up self wikilinks
            string articleTextAtStart = articleText, zerothSection = Tools.GetZerothSection(articleText);
            string restOfArticle = articleText.Substring(zerothSection.Length);
            string zerothSectionHidden, zerothSectionHiddenOriginal;

            // first check for any self links and no bold title, if found just convert first link to bold and return
            // https://en.wikipedia.org/wiki/Wikipedia_talk:AutoWikiBrowser/Bugs/Archive_11#Includes_and_selflinks
            // don't apply if bold in lead section already or some noinclude transclusion business
            if (!SelfLinks(zerothSection, articleTitle).Equals(zerothSection) && !WikiRegexes.IncludeonlyNoinclude.IsMatch(articleText))
            {
                // There's a limitation here in that we can't hide image descriptions that may be above lead sentence without hiding the self links we are looking to correct
                zerothSectionHidden = Hider2.HideMore(zerothSection, false, false, false);
                zerothSectionHiddenOriginal = zerothSectionHidden;
                zerothSectionHidden = SelfLinks(zerothSectionHidden, articleTitle);
                zerothSection = Hider2.AddBackMore(zerothSectionHidden);

                if (!zerothSectionHiddenOriginal.Equals(zerothSectionHidden))
                {
                    noChange = false;
                    return (zerothSection + restOfArticle);
                }
            }

            // Performance check: if article title not in zeroth section have nothing further to do
            if (zerothSection.IndexOf(BracketedAtEndOfLine.Replace(articleTitle, ""), StringComparison.OrdinalIgnoreCase) < 0)
                return articleTextAtStart;

            // 3) '''Emboldens''' the first occurrence of the article title

            // ignore date articles (date in American or international format), nihongo title
            if (WikiRegexes.Dates2.IsMatch(articleTitle) || WikiRegexes.Dates.IsMatch(articleTitle)
                || TemplateExists(alltemplates, NihongoTitle))
                return articleTextAtStart;

            string escTitle = Regex.Escape(articleTitle), escTitleNoBrackets = Regex.Escape(BracketedAtEndOfLine.Replace(articleTitle, ""));
            Regex boldTitleAlready1 = new Regex(@"'''\s*(" + escTitle + "|" + Tools.TurnFirstToLower(escTitle) + @")\s*'''");
            Regex boldTitleAlready2 = new Regex(@"'''\s*(" + escTitleNoBrackets + "|" + Tools.TurnFirstToLower(escTitleNoBrackets) + @")\s*'''");

            // if title in bold already exists in article, or paragraph starts with something in bold, don't change anything
            // ignore any bold in infoboxes
            if (BoldTitleAlready4.IsMatch(Tools.ReplaceWithSpaces(zerothSection, WikiRegexes.InfoBox.Matches(zerothSection))) || DfnTag.IsMatch(zerothSection))
                return articleTextAtStart;

            string articleTextNoInfobox = Tools.ReplaceWithSpaces(articleText, WikiRegexes.InfoBox.Matches(articleText));
            if (boldTitleAlready1.IsMatch(articleTextNoInfobox) || boldTitleAlready2.IsMatch(articleTextNoInfobox)
                || BoldTitleAlready3.IsMatch(articleTextNoInfobox))
                return articleTextAtStart;

            // so no self links to remove, check for the need to add bold
            string articleTextNoTemplates = WikiRegexes.NestedTemplates.Replace(articleText, "");

            // first quick check: ignore articles with some bold in first 5% of article, ignoring infoboxes, dablinks etc.
            int fivepc = articleTextNoTemplates.Length / 20;

            if (articleTextNoTemplates.Substring(0, fivepc).Contains("'''"))
                return articleTextAtStart;

            Regex regexBoldNoBrackets = new Regex(@"([^\[]|^)(" + escTitleNoBrackets + "|" + Tools.TurnFirstToLower(escTitleNoBrackets) + ")([ ,.:;])");

            zerothSectionHidden = Hider3.HideMore(zerothSection);
            zerothSectionHiddenOriginal = zerothSectionHidden;

            // first try title with brackets removed
            zerothSectionHidden = regexBoldNoBrackets.Replace(zerothSectionHidden, "$1'''$2'''$3", 1);

            zerothSection = Hider3.AddBackMore(zerothSectionHidden);

            articleText = zerothSection + restOfArticle;

            // check that the bold added is the first bit in bold in the main body of the article
            if (!zerothSectionHiddenOriginal.Equals(zerothSectionHidden) && AddedBoldIsValid(articleText, escTitleNoBrackets))
            {
                noChange = false;
                return articleText;
            }

            return articleTextAtStart;
        }