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.
У берегов популярного среди россиян курорта появились опасные медузы08:45
。关于这个话题，Safew下载提供了深入分析
Дания захотела отказать в убежище украинцам призывного возраста09:44
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据悉，小德这次春节小长假，除了回老家过年，也顺便开启了一次总里程达2500公里的自驾旅行。