Scans regex from msg and returns the line that matches

        Keyword arguments:
        message -- A (long) string, e.g. email body that will be
        scanned.

        regex -- A regular expression string that the message will be
        scanned against.

        Returns:
        Matching line or empty string

def scan_message(self, message, regex):
        """Scans regex from msg and returns the line that matches

        Keyword arguments:
        message -- A (long) string, e.g. email body that will be
        scanned.

        regex -- A regular expression string that the message will be
        scanned against.

        Returns:
        Matching line or empty string
        """
        for line in message.split("\n"):
            if bool(re.search(
                    regex,
                    line,
                    flags=re.IGNORECASE|re.MULTILINE)):
                return line
        return ""