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<?php preg_match_all('/\\[mygroup +([^]]+?)\\]\s*\\[(file\\*[^]]+?)\]/', '[mygroup group-name-1] [file* field-name-134 limit:200] [mygroup group-name-2] [file* field-name-135 limit:200] [/mygroup] [/mygroup]', $matches); print_r($matches);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Array ( [0] => Array ( [0] => [mygroup group-name-1] [file* field-name-134 limit:200] [1] => [mygroup group-name-2] [file* field-name-135 limit:200] ) [1] => Array ( [0] => group-name-1 [1] => group-name-2 ) [2] => Array ( [0] => file* field-name-134 limit:200 [1] => file* field-name-135 limit:200 ) )

preferences:
95.01 ms | 1592 KiB | 4 Q