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.
西凤酒的芬芳，源于国家非物质文化遗产——西凤酒酿造技艺。古法传承，代代相守，方成就西凤酒“醇香典雅、甘润挺爽”的独特凤香。这缕香气，更因在被誉为“活文物”的百年酒海中陈藏而愈显醇厚。西凤百年酒海是以传统技艺编制、由内壁向外用百层天然材质裱糊的储酒容器，是时间与风土的对话之所，赋予酒体醇厚绵长的韵味。，这一点在雷速体育中也有详细论述
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