3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $subject = '{"_id":"scheme_version","_rev":"4-cad1842a7646b4497066e09c3788e724","scheme_version":1234}'; $pattern = '(?<=scheme_version":)[0-9]+'; echo preg_grep($pattern, array($subject));
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_grep(): Unknown modifier '[' in /in/Jvvt1 on line 4
Output for hhvm-3.12.0
Warning: Unknown modifier '[': [(?<=scheme_version":)[0-9]+] in /in/Jvvt1 on line 4
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '[' in /in/Jvvt1 on line 4