code: def escape_special_characters(s: str) -> str:
      """Escape special characters in `s`"""
      matches = _ESC_REGEX.findall(s)
      if not matches:
          return s
      # Replace all special characters found in `s`. Performance should not be critical
      # so we do one pass per special character.
      all_special = set("".join(matches))
      # '\' is even more special: it needs to be replaced first, otherwise we will
      # mess up the other escaped characters.
      try:
          all_special.remove("\\")
      except KeyError:
          pass  # no '\' in the string
      else:
          s = s.replace("\\", "\\\\")
      for special_char in all_special:
          s = s.replace(special_char, f"\\{special_char}")
      return s
  
imports: import inspect
  import re
  from typing import Any, Union
  from omegaconf._utils import is_dict_annotation, is_list_annotation
label_desc: Use image node_id 1 for calling a global function with example usage: escape_special_characters(s) and returns: s, s