code: def regex_to_gbnf(regex_pattern: str) -> str:
      """
      Translate a basic regex pattern to a GBNF rule.
      Note: This function handles only a subset of simple regex patterns.
      """
      gbnf_rule = regex_pattern
  
      # Translate common regex components to GBNF
      gbnf_rule = gbnf_rule.replace("\\d", "[0-9]")
      gbnf_rule = gbnf_rule.replace("\\s", "[ \t\n]")
  
      # Handle quantifiers and other regex syntax that is similar in GBNF
      # (e.g., '*', '+', '?', character classes)
  
      return gbnf_rule
  
imports: import inspect
  import json
  from copy import copy
  from inspect import isclass, getdoc
  from types import NoneType
  from docstring_parser import parse
  from pydantic import BaseModel, create_model, Field
  from typing import Any, Type, List, get_args, get_origin, Tuple, Union, Optional, _GenericAlias
  from enum import Enum
  from typing import get_type_hints, Callable
  import re
  from enum import Enum
label_desc: Use image node_id 5 for calling a global function with example usage: regex_to_gbnf(regex_pattern) and returns: gbnf_rule