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run code in 200+ php & hhvm versions
Bugs & Features
<?php preg_match("/^validation/(\w+)?/(\w+)?/$/", "validation/aa/1/",$matches); print_r($matches); echo "\n";
Output for 5.2.0 - 7.2.0
Warning: preg_match(): Unknown modifier '(' in /in/qnuWd on line 2
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Unknown modifier '(' in /in/qnuWd on line 2 Array ( )
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '(' in /in/qnuWd on line 2 Array ( )