def __init__(self, tag_pattern, descr):
        """
        Construct a new ``UnChunkRule``.

        :type tag_pattern: str
        :param tag_pattern: This rule's tag pattern.  When
            applied to a ``ChunkString``, this rule will
            find any complete chunk that matches this tag pattern,
            and un-chunk it.
        :type descr: str
        :param descr: A short description of the purpose and/or effect
            of this rule.
        """
        self._pattern = tag_pattern
        regexp = re.compile('\{(?P<chunk>%s)\}' +
                            tag_pattern2re_pattern(tag_pattern))
        RegexpChunkRule.__init__(self, regexp, '\g<chunk>', descr)
dataset/ETHPy150Open nltk/nltk/nltk/chunk/regexp.py/UnChunkRule.__init__/operator `%` -> `+`