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<?php var_dump(preg_match_all('/(?<!%)%([^%]+)%/', '%ad% %asdsl%', $matches)); var_dump($matches);
Output for 4.3.0 - 7.1.0
int(2) array(2) { [0]=> array(2) { [0]=> string(4) "%ad%" [1]=> string(7) "%asdsl%" } [1]=> array(2) { [0]=> string(2) "ad" [1]=> string(5) "asdsl" } }