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<?php preg_match_all("/(\d+)|\(([^\(]+)\)/","2(3,4)(5,6,7,8,9)",$matches); print_r($matches);
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Array ( [0] => Array ( [0] => 2 [1] => (3,4) [2] => (5,6,7,8,9) ) [1] => Array ( [0] => 2 [1] => [2] => ) [2] => Array ( [0] => [1] => 3,4 [2] => 5,6,7,8,9 ) )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [0] => Array ( [0] => 2 [1] => (3,4) [2] => (5,6,7,8,9) ) [1] => Array ( [0] => 2 [1] => [2] => ) [2] => Array ( [0] => [1] => 3,4 [2] => 5,6,7,8,9 ) )

preferences:
185.5 ms | 402 KiB | 214 Q