3v4l.org

run code in 500+ PHP versions simultaneously
<?php $str = "**test**"; $str = preg_replace('/\*\*(\w+)\*\*/', '<b>$1</b>', $str); echo $str;
Output for 7.3.33, 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
<b>test</b>

preferences:
94.32 ms | 1279 KiB | 4 Q