code: def data_regex_method(fields_list, mongo_db_obj, hist, record, lookup_type):
          
  
          if hist is None:
              hist = {}
  
          for field in record:
  
              if record[field] != '' and record[field] is not None:
  
                  if field in fields_list:
  
                      if lookup_type in fields_list[field]['lookup']:
  
                          field_val_new, hist = RegexLookup(
                              fieldVal=record[field],
                              db=mongo_db_obj,
                              fieldName=field,
                              lookupType=lookup_type,
                              histObj=hist)
  
                          record[field] = field_val_new
  
          return record, hist
docs: Method to lookup the replacement value based on regular expressions.
  
          :param dict fields_list: Fields configurations
          :param MongoClient mongo_db_obj: MongoDB collection object
          :param dict hist: existing input of history values object
          :param dict record: values to validate
          :param str lookup_type: Type of lookup