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<?php preg_match('/(\<!--\s*.*?((--\>)|$))/imsx', '<!-- com1 <!-- com 2 <!-- com2.1 --> --> <!-- com3 --> -->', $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(38) "<!-- com1 <!-- com 2 <!-- com2.1 -->" [1]=> string(38) "<!-- com1 <!-- com 2 <!-- com2.1 -->" [2]=> string(3) "-->" [3]=> string(3) "-->" }

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