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<?php preg_match_all( '#((?:^|[A-Z])[a-z]+)#', 'max_file_size', $matches ); var_dump( $matches );
Output for 4.3.0 - 7.1.0
array(2) { [0]=> array(1) { [0]=> string(3) "max" } [1]=> array(1) { [0]=> string(3) "max" } }