Online PHP editor | refs for MjB11

<?php echo "Normal match:\n"; preg_match('/two/', 'two', $match); var_dump($match); echo "Unmatched $1 is not reported:\n"; preg_match('/(one)?two/', 'two', $match); var_dump($match); preg_match('/two(three)?/', 'two', $match); var_dump($match); echo "Unmatched $1 is reported if $2 is set:\n"; preg_match('/(one)?(two)/', 'two', $match); var_dump($match); echo "Unmatched $2 is not reported even though $1 is set:\n"; preg_match('/(two)(three)?/', 'two', $match); var_dump($match);