Return the next comment found in text starting at start.

def nextComment(self, text, start=0):
        """Return the next comment found in text starting at start.

        """

        m = min([self.lineComment(text, start),
                 self.blockComment(text, start),
                 self._emptylineregex.search(text, start)],
                key=lambda m: m.start(0) if m else len(text))
        return m