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Bugs & Features
<?php $pattern="/\(((?>[^()]+)|(?R))*\)/"; $str = <<< LOL (def a (x) (+ 1 x)) (print (a 1)) LOL; preg_match_all($pattern,$str,$out); var_dump($out);
Output for 4.3.0 - 7.1.0
array(2) { [0]=> array(2) { [0]=> string(21) "(def a (x) (+ 1 x))" [1]=> string(13) "(print (a 1))" } [1]=> array(2) { [0]=> string(7) "(+ 1 x)" [1]=> string(5) "(a 1)" } }