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you can match a string by repeatedly taking derivatives for each character. when you’ve consumed the entire input, you check if the resulting regex accepts the empty string (is “nullable”). if yes, the original string matched.
，更多细节参见91视频
Мэр города занялась сексом с 16-летним подростком на глазах у своих детей02:00，更多细节参见51吃瓜
self: ValueWatcher[S | None],