code: def registered_labels(self):
      return self._regexp_mapping
  
file_path: flair/flair/models/regexp_tagger.py
imports: import re
  import typing
  from dataclasses import dataclass, field
  from typing import Dict, List, Tuple, Union
  from flair.data import Sentence, Span, Token
label_desc: Use image node_id 2 for calling the RegexpTagger obj's underlying member method code with example usage: obj.registered_labels() and returns: self