3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "( 小黄蜂250 OR 小黄峰 OR 幻影150 ) "; var_dump($str = preg_replace('/\(\s?(^\s.*^\s)\s?\)/', '($1)', $str));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(44) "( 小黄蜂250 OR 小黄峰 OR 幻影150 ) "

preferences:
279.85 ms | 405 KiB | 420 Q