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<?php $pattern="\( ( (?>[^()]+) | (?R) )* \)"; $str="(def a (x) (+ 1 x))(print (a 1))"; var_dump(preg_match_all ($pattern,$str));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match_all(): Delimiter must not be alphanumeric, backslash, or NUL in /in/g3TmF on line 9 bool(false)

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