3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = 'Donec gravida #*c_01*# quam nec pulvinar #*c_02*# facilisis. Donec sed consectetur #*c_03*# lectus'; $str = preg_replace('/#\*(.+?)\*#/', '___', $str, 1); echo $str, "\n";

preferences:
41.07 ms | 402 KiB | 5 Q