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<?php $test = "5+2(23*5)(1-2)"; $regex = "/(\d|\))\(/"; preg_match_all($regex, $test, $match); var_dump($match);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> array(2) { [0]=> string(2) "2(" [1]=> string(2) ")(" } [1]=> array(2) { [0]=> string(1) "2" [1]=> string(1) ")" } }