and of course for IsMatch there is no difference in which direction you go, you can just stop at the first match and return true. in fact lookarounds aren’t necessary for IsMatch at all, they are indistinguishable from concatenation. a(?=b) is just ab for the purposes of IsMatch and a(?=.*b)(?=.*c) is just a(.*b_*&.*c_*) - the lookarounds only come into play when you want to know the position of the match, and what is around it. if you happen to use lookarounds in an IsMatch pattern today, consider RE# intersections a faster drop-in replacement with identical semantics.
До этого Китай ужесточил контроль за экспортом в Японию товаров двойного назначения, имеющих как гражданское, так и военное применение, включая редкоземельные элементы.
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相关论文：https://arxiv.org/abs/2505.24298，这一点在搜狗输入法下载中也有详细论述
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