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Bugs & Features
<?php preg_match('/list/page/3', '#^/list(?:/type/(\d+))?(?:/page/(\d+))?$#', $matches); var_dump($matches);
Output for 5.2.0 - 7.2.0
Warning: preg_match(): Unknown modifier 'p' in /in/TX72s on line 3 NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Unknown modifier 'p' in /in/TX72s on line 3 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'p' in /in/TX72s on line 3 array(0) { }