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<?php preg_match('(l)|(a)','bab',$matches); var_dump(isset($matches[1]));
Output for 4.3.11 - 7.1.0
Warning: preg_match(): Unknown modifier '|' in /in/eoN3V on line 2 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '|' in /in/eoN3V on line 2 bool(false)