def change(self, irc, msg, args, channel, number, replacer):
        self._checkManageCapabilities(irc, msg, channel)
        topics = self._splitTopic(irc.state.getTopic(channel), channel)
        topics[number] = replacer(topics[number])
        self._sendTopics(irc, channel, topics)
[<channel>] <number> <regexp>
dataset/ETHPy150Open ProgVal/Limnoria/plugins/Topic/plugin.py/Topic.change