lowerCaseLink

                    const QString tempstring1 =             "^"
                            // Identifier for http and ftp
                            "(?:(?:https?|ftps?)://)?"
                            // user:pass authentication
                            "(?:\\S+(?::\\S*)?@)?"
                            "(?:"
                            // IP address dotted notation octets
                            // excludes loopback network 0.0.0.0
                            // excludes reserved space >= 224.0.0.0
                            // excludes network & broacast addresses
                            // (first & last IP address of each class)
                            "(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])"
                            "(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}"
                            "(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))"
                            "|"
                            // host name
                            "(?:(?:[_a-z\\x{00a1}-\\x{ffff}0-9]-*)*[a-z\\x{00a1}-\\x{ffff}0-9]+)"
                            // domain name
                            "(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}0-9]-*)*[a-z\\x{00a1}-\\x{ffff}0-9]+)*"
                            // TLD identifier
                            "(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}]{2,}))"
                            "\\.?"
                            ")"
                            // port number
                            "(?::\\d{2,5})?";
                    QRegularExpression getDomain(tempstring1, QRegularExpression::CaseInsensitiveOption);
                    QString tempString = string;
                    QStringList list1 = tempString.split(getDomain);

                    QString lowercaseLinkString = list1[0].toLower() + list1[1];

                    link = Link(Link::Url, linkString);
                    textColor = MessageColor(MessageColor::Link);
                    this->emplace<TextElement>(lowercaseLinkString, TextElement::LowercaseLink,
                                               textColor)
                        ->setLink(link);
                    this->emplace<TextElement>(string, TextElement::OriginalLink, textColor)
                        ->setLink(link);