3v4l.org

run code in 300+ PHP versions simultaneously
<?php $subject = 'OBKFA4F26ORJI3ALFYI3QB4ZN'; $expr = '/.{5}(?!$)/'; var_dump(preg_replace($expr, '$0-', $subject));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(29) "OBKFA-4F26O-RJI3A-LFYI3-QB4ZN"
preferences:
219.68 ms | 406 KiB | 326 Q