code: def test_regexp_tagger(self):
      tagger = RegexpTagger(
          [(r".*", "NN")], backoff=self.default_tagger
      )
  
      encoded = self.encoder.encode(tagger)
      decoded = self.decoder.decode(encoded)
  
      self.assertEqual(repr(tagger), repr(decoded))
      self.assertEqual(repr(tagger.backoff), repr(decoded.backoff))
      self.assertEqual(tagger._regexps, decoded._regexps)
  
file_path: nltk/nltk/test/unit/test_json_serialization.py
imports: import unittest
  from nltk.corpus import brown
  from nltk.jsontags import JSONTaggedDecoder, JSONTaggedEncoder
  from nltk.tag import AffixTagger, BigramTagger, BrillTagger, BrillTaggerTrainer, DefaultTagger, NgramTagger, PerceptronTagger, RegexpTagger, TrigramTagger, UnigramTagger
  from nltk.tag.brill import nltkdemo18
label_desc: Use image node_id 3 for calling the TestJSONSerialization obj's underlying member method code with example usage: obj.test_regexp_tagger() without return types