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<?php $code = "$1?1?2/:1$2?3?4?5/:2$3E/:3$8?1?2/:4$5$7E/:5$6$7E/:1$7E/:2$4/"; preg_match_all('~\$\K\d+~', $code, $matches); print_r($matches[0]);

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38.29 ms | 405 KiB | 6 Q