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<?php var_dump(preg_match_all('/(?<!%)%([^%]+)%/', '%%adasdsl%%', $matches)); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) array(2) { [0]=> array(0) { } [1]=> array(0) { } }