3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo preg_replace('~@\w+\K\s{2,}~', ' ', 'This is an @example input.');
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
This is an @example input.
preferences:
98.58 ms | 1977 KiB | 4 Q