Argentini.Halide.H3Http.BuildMatch C# (CSharp) Method

        private static String BuildMatch(String pattern, String userAgent, String browser, Int32 versionIndex, String browserNameVersionFallback, out String browserName, out Int64 majorVersion, out Int64 minorVersion, out Int64 buildVersion)
        {
            browserName = browser;
            majorVersion = 0;
            minorVersion = 0;
            buildVersion = 0;

            Match match = Regex.Match(userAgent, pattern, RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);

            if (match.Success)
            {
                string key = match.Groups[versionIndex].Value;

                key = key.Replace("_", ".");

                String[] versions = key.Split('.');

                // Handle minor build versioning without dot syntax (leading zeroes)
                // (9.06 becomes 9.0.6)
                if (versions.Length > 1 && versions[1].StartsWith("0"))
                {
                    key = key.Replace(versions[0] + "." + versions[1], versions[0] + ".0." + Convert.ToInt64(versions[1]));
                    versions = key.Split('.');
                }

                if (versions.Length > 0)
                {
                    if (versions[0].Length > 18)
                    {
                        versions[0] = versions[0].Substring(0, 18);
                    }

                    if (H3Identify.IsPureNumeric(versions[0]))
                    {
                        majorVersion = Convert.ToInt64(versions[0]);
                    }
                }

                if (versions.Length > 1)
                {
                    if (versions[1].Length > 18)
                    {
                        versions[1] = versions[1].Substring(0, 18);
                    }

                    if (H3Identify.IsPureNumeric(versions[1]))
                    {
                        minorVersion = Convert.ToInt64(versions[1]);
                    }
                }

                if (versions.Length > 2)
                {
                    if (versions[2].Length > 18)
                    {
                        versions[2] = versions[2].Substring(0, 18);
                    }

                    if (H3Identify.IsPureNumeric(versions[2]))
                    {
                        buildVersion = Convert.ToInt64(versions[2]);
                    }
                }

                browser += " " + majorVersion + "." + minorVersion + (buildVersion > 0 ? "." + buildVersion : "");
            }

            else
            {
                if (browserNameVersionFallback != "")
                {
                    browser = browserName = browserNameVersionFallback;
                }
            }

            return browser;
        }