code: def header_decode(s):
      """Decode a string encoded with RFC 2045 MIME header `Q' encoding.
  
      This function does not parse a full MIME header value encoded with
      quoted-printable (like =?iso-8859-1?q?Hello_World?=) -- please use
      the high level email.header class for that functionality.
      """
      s = s.replace("_", " ")
      return re.sub(
          r"=[a-fA-F0-9]{2}", _unquote_match, s, flags=re.ASCII
      )
  
file_path: catboost/contrib/tools/python3/src/Lib/email/quoprimime.py
imports: import re
  from string import ascii_letters, digits, hexdigits
label_desc: Use image node_id 12 for calling a global function with example usage: header_decode(s) and returns: re