code: def ok_cred_def_id(token: str, issuer_did: str = None) -> bool:
      
  
      cd_id_m = re.match('([{}]{{21,22}}):3:CL:[1-9][0-9]*(:.+)?$'.format(B58), token or '')
      return bool(cd_id_m) and ((not issuer_did) or cd_id_m.group(1) == issuer_did)
docs: Whether input token looks like a valid credential definition identifier from input issuer DID (default any); i.e.,
      <issuer-did>:3:CL:<schema-seq-no>:<cred-def-id-tag> for protocol >= 1.4, or
      <issuer-did>:3:CL:<schema-seq-no> for protocol == 1.3.
  
      :param token: candidate string
      :param issuer_did: issuer DID to match, if specified
      :return: whether input token looks like a valid credential definition identifier