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run code in 150+ php & hhvm versions
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<?php $comment = ' <!-- comment <!-- commentreer --> -->'; preg_match('/(\<!--\s*.*?((--\>)|$))/imsx', $comment, $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(35) "<!-- comment <!-- commentreer -->" [1]=> string(35) "<!-- comment <!-- commentreer -->" [2]=> string(3) "-->" [3]=> string(3) "-->" }