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<?php var_dump(preg_match_all('#/search/(?P<mac>(?:[[:xdigit:]]{2}([-:]))(?:[[:xdigit:]]{2}\2){4}[[:xdigit:]]{2})#', 'asdf', $matches)); var_dump($matches);
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) array(4) { [0]=> array(0) { } ["mac"]=> array(0) { } [1]=> array(0) { } [2]=> array(0) { } }
Output for 4.3.0 - 4.3.2
int(0) array(3) { [0]=> array(0) { } [1]=> array(0) { } [2]=> array(0) { } }