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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _text(self, text):
        '''Parse a Tweet without generating HTML.'''
        URL_REGEX.sub(self._parse_urls, text)
        USERNAME_REGEX.sub(self._parse_users, text)
        LIST_REGEX.sub(self._parse_lists, text)
        HASHTAG_REGEX.sub(self._parse_tags, text)
        return None