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.
В России предупредили о скорой нехватке вагонов08:46
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Последние новости
對數以億計的亞洲年輕人來說，這個浪潮是他們正親身經歷著的一部分，也代表著一種新的可能。
What's going on? Two effects: