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<?php $pattern="\( ( (?>[^()]+) | (?R) )* \)"; $str="(def a (x) (+ 1 x))(print (a 1))"; var_dump(preg_grep($pattern,$str));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: preg_grep(): Argument #2 ($array) must be of type array, string given in /in/Su6e3:9 Stack trace: #0 /in/Su6e3(9): preg_grep('\\( ( (?>[^()]+)...', '(def a (x) (+ 1...') #1 {main} thrown in /in/Su6e3 on line 9
Process exited with code 255.

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