$re = '/[\u4e00-\u9fa5]{3,}(第一|质量|最)[\u4e00-\u9fa5]{3,}/m';
$str = '我国依然是世界上第一人口的国家;中国制造的产品质量依然是....根据数据分析得到的数据结果是最准确的!';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php