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run code in 150+ php & hhvm versions
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<?php preg_match("validation/([^/]+)/([^/]+)/?", "validation/aa/1/",$matches); print_r($matches); echo "\n";
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/RckF6 on line 2
Output for hhvm-3.12.0
Warning: Delimiter must not be alphanumeric or backslash in /in/RckF6 on line 2
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/RckF6 on line 2 Array ( )
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/RckF6 on line 2 Array ( )