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run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = "(hello(world)) program"; preg_match_all('/(\(([^()]|(?R))*\))/', $str, $matches); print_r($matches);
Output for 4.3.0 - 7.1.0
Array ( [0] => Array ( [0] => (hello(world)) ) [1] => Array ( [0] => (hello(world)) ) [2] => Array ( [0] => (world) ) )