docs: def createSubtitle(self, fps, section):
          """Returns a correct 'Subtitle' object from a text given in 'section'. If 'section' cannot
          be parsed, None is returned.
          By default 'section' is checked against 'subPattern' regular expression."""
          matched = self._pattern.search(section)
          if matched is not None:
              matchedDict = matched.groupdict()
              return Subtitle(
                  self.frametime(fps, matchedDict.get("time_from")),
                  self.frametime(fps, matchedDict.get("time_to")),
                  self.formatSub(matchedDict.get("text"))
              )
          return None