3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = '3:1,1:2,2:3'; $string = preg_replace('#1:(\d*),#', 'whateverToReplaceWith', $string); echo $string;
Output for 7.0.0 - 7.0.23, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
3:1,whateverToReplaceWith2:3
preferences:
122.87 ms | 404 KiB | 179 Q