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<?php $a = preg_match('test|jajko', 'bardzo_jajko_fajne'); var_dump($a);
based on P6ZB9
Output for 4.3.11 - 7.1.10
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/iT4XC on line 2 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/iT4XC on line 2 bool(false)