WikiFunctions.Summary.ModifiedSection C# (CSharp) Method

        public static string ModifiedSection(string originalText, string articleText)
        {
            string[] sectionsBefore = Tools.SplitToSections(originalText),
            sectionsAfter = Tools.SplitToSections(articleText);

            // if number of sections has changed, can't provide section edit summary
            if (sectionsAfter.Length != sectionsBefore.Length)
                return "";

            int sectionsChanged = 0, sectionChangeNumber = 0;

            for (int i = 0; i < sectionsAfter.Length; i++)
            {
                if (!sectionsBefore[i].Equals(sectionsAfter[i]))
                {
                    sectionsChanged++;
                    sectionChangeNumber = i;
                }

                // if multiple sections changed, can't provide section edit summary
                if (sectionsChanged > 1)
                    return "";
            }

            if(sectionsChanged == 0)
                return "";

            // so SectionsChanged == 1, get heading name from regex, or return "top" if zeroth section
            string heading = WikiRegexes.Headings.Match(sectionsAfter[sectionChangeNumber]).Groups[1].Value.Trim();
            return (heading.Length == 0 ? "top" : heading);
        }