original_string: public function find_dataset_names($text) {
          preg_match_all(self::PLACEHODLER_REGEX, $text, $matches);
          return array_combine($matches[1], $matches[1]);
      }
code: public function find_dataset_names($text) {
          preg_match_all(self::PLACEHODLER_REGEX, $text, $matches);
          return array_combine($matches[1], $matches[1]);
      }
code_tokens: public function find_dataset_names ( $ text ) { preg_match_all ( self :: PLACEHODLER_REGEX , $ text , $ matches ) ; return array_combine ( $ matches [ 1 ] , $ matches [ 1 ] ) ; }
docstring: Find the names of all datasets mentioned in a piece of question content like the question text.
  @param $text the text to analyse.
  @return array with dataset name for both key and value.
docstring_tokens: Find the names of all datasets mentioned in a piece of question content like the question text .