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<?php preg_match('/(\<!--\s*.*?((--\>)|$))/imsx', '<!-- com1 <!-- com 2 <!-- com2.1 --> --> <!-- com3 --> -->', $matches); var_dump($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(38) "<!-- com1 <!-- com 2 <!-- com2.1 -->" [1]=> string(38) "<!-- com1 <!-- com 2 <!-- com2.1 -->" [2]=> string(3) "-->" [3]=> string(3) "-->" }