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<?php preg_match_all('`{([^{}]+)}(\(((?>[^()]+|(?2))*)\))`', 'test {22413}(ghfhgfhg(())sd(d)sf) s{1}(l(k)l)dfdsf {5}(45d4fsdf4)', $m); print_r($m);

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39.12 ms | 402 KiB | 5 Q