code: def test_tag_pattern2re_pattern_quantifier(self):
      """Test for bug https://github.com/nltk/nltk/issues/1597
  
      Ensures that curly bracket quantifiers can be used inside a chunk rule.
      This type of quantifier has been used for the supplementary example
      in https://www.nltk.org/book/ch07.html#exploring-text-corpora.
      """
      sent = [
          ("The", "AT"),
          ("September-October", "NP"),
          ("term", "NN"),
          ("jury", "NN"),
          ("had", "HVD"),
          ("been", "BEN"),
          ("charged", "VBN"),
          ("by", "IN"),
          ("Fulton", "NP-TL"),
          ("Superior", "JJ-TL"),
          ("Court", "NN-TL"),
          ("Judge", "NN-TL"),
          ("Durwood", "NP"),
          ("Pye", "NP"),
          ("to", "TO"),
          ("investigate", "VB"),
          ("reports", "NNS"),
          ("of", "IN"),
          ("possible", "JJ"),
          ("``", "``"),
          ("irregularities", "NNS"),
          ("''", "''"),
          ("in", "IN"),
          ("the", "AT"),
          ("hard-fought", "JJ"),
          ("primary", "NN"),
          ("which", "WDT"),
          ("was", "BEDZ"),
          ("won", "VBN"),
          ("by", "IN"),
          ("Mayor-nominate", "NN-TL"),
          ("Ivan", "NP"),
          ("Allen", "NP"),
          ("Jr.", "NP"),
          (".", "."),
      ]  # source: brown corpus
      cp = RegexpParser("CHUNK: {<N.*>{4,}}")
      tree = cp.parse(sent)
      assert (
          tree.pformat()
          == """(S
    The/AT
    September-October/NP
    term/NN
    jury/NN
    had/HVD
    been/BEN
    charged/VBN
    by/IN
    Fulton/NP-TL
    Superior/JJ-TL
    (CHUNK Court/NN-TL Judge/NN-TL Durwood/NP Pye/NP)
    to/TO
    investigate/VB
    reports/NNS
    of/IN
    possible/JJ
    ``/``
    irregularities/NNS
    ''/''
    in/IN
    the/AT
    hard-fought/JJ
    primary/NN
    which/WDT
    was/BEDZ
    won/VBN
    by/IN
    (CHUNK Mayor-nominate/NN-TL Ivan/NP Allen/NP Jr./NP)
    ./.)"""
      )
  
imports: import unittest
  from nltk import RegexpParser
label_desc: Use image node_id 1 for calling the TestChunkRule obj's underlying member method code with example usage: obj.test_tag_pattern2re_pattern_quantifier() without return types