3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $c = " total used free shared buffers cached\nMem: 494 383 111 0 29 200\n-/+ buffers/cache: 153 341\nSwap: 255 0 255"; preg_match("Mem:\s+(?<total>\d+)", $c ,$r); print_r($r);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/eKJjD on line 4
Output for hhvm-3.10.0 - 3.12.0
Warning: Delimiter must not be alphanumeric or backslash in /in/eKJjD on line 4
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/eKJjD on line 4 Array ( )
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/eKJjD on line 4 Array ( )