code: def select_objects(self, json_string, expr):
          
          load_input_json = self.string_to_json(json_string)
          # parsing objectpath
          tree = objectpath.Tree(load_input_json)
          values = tree.execute(expr)
          return list(values)
docs: Return list of elements from _json_string_, matching [ http://objectpath.org// | ObjectPath] expression.
  
          *Args:*\n
          _json_string_ - JSON string;\n
          _expr_ - ObjectPath expression;
  
          *Returns:*\n
          List of found elements. If no elements were found, empty list will be returned
  
          *Example:*\n
          | *Settings* | *Value* |
          | Library    | JsonValidator |
          | Library    | OperatingSystem |
          | *Test Cases* | *Action* | *Argument* | *Argument* |
          | Select json objects  | ${json_example}=   | OperatingSystem.Get File |   ${CURDIR}${/}json_example.json |
          |                      |  ${json_objectss}= | Select objects  |  ${json_example}  |  $..book[@.author.name is "Evelyn Waugh"].price |
          =>\n
          | [12.99]