3v4l.org

run code in 300+ PHP versions simultaneously
<?php $wordlist = 'systematic,gear,synthesis,mysterious'; $words = explode(',', $wordlist); foreach($words as $word) { if (preg_match('~(?=[^s]*s)(?=[^m]*m)(?=[^e]*e)~', $word)) echo '<br/>' . $word; }
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 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<br/>systematic<br/>mysterious
preferences:
269.02 ms | 406 KiB | 460 Q