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Regular Expression
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\([^)(]*(?:\([^)(]*(?:\([^)(]*(?:\([^)(]*\)[^)(]*)*\)[^)(]*)*\)[^)(]*)*\)
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g
Input 1
1
New
some text(text here(possible text)text(possible text(more text)))end text text (l0 (l1 (l2)) l0 (l1 (l2 (l3))) (l1)) text (l0 (l1) (l1 ((l3) l2)) (l1)) text
Extraction
some text(text here(possible text)text(possible text(more text)))end text text (l0 (l1 (l2)) l0 (l1 (l2 (l3))) (l1)) text (l0 (l1) (l1 ((l3) l2)) (l1)) text