def __init__(self, tag_pattern, descr):
        self._pattern = tag_pattern
        regexp = re.compile('\{(?P<chunk>%s)\}' %
                            tag_pattern2re_pattern(tag_pattern))
        RegexpChunkRule.__init__(self, regexp, '\g<chunk>', descr)
Construct a new ``UnChunkRule``.
dataset/ETHPy150Open nltk/nltk/nltk/chunk/regexp.py/UnChunkRule.__init__