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<?php preg_match_all('/(4)?(2)?\d/', '123456', $matches, PREG_SET_ORDER); var_export($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => '1', ), 1 => array ( 0 => '23', 1 => '', 2 => '2', ), 2 => array ( 0 => '45', 1 => '4', ), 3 => array ( 0 => '6', ), )

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