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<?php $pattern="/\(((?>[^()]+)|(?R))*\)/"; $str="(def a (x) (+ 1 x))(print (a 1))"; //$str="(aaa)("a")"; preg_match_all($pattern,$str,$out); var_dump($out);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(2) { [0]=> string(19) "(def a (x) (+ 1 x))" [1]=> string(13) "(print (a 1))" } [1]=> array(2) { [0]=> string(7) "(+ 1 x)" [1]=> string(5) "(a 1)" } }

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