Available question text
Filter the coupons to those with a non-empty code containing only alphanumeric characters or underscores, a businessLine in {"electronics","grocery","pharmacy","restaurant"}, and isActive == true. Return the codes of the valid coupons sorted by the businessLine priority (electronics, grocery, pharmacy, restaurant) and lexicographically within each category.
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Leetcode 3606. Coupon Code Validator
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Source snapshot: Nov 12, 2026
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