3v4l.org

run code in 500+ PHP versions simultaneously
<?php $txt = <<<TEXT .1 1.5 0.10 .8 TEXT; echo preg_replace('/^\.(?=\d)/m', '0.', $txt);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
0.1 1.5 0.10 0.8
preferences:
90.73 ms | 1264 KiB | 4 Q