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.
В Израиле возросло число погибших из-за ударов ИранаABC: В Израиле из-за ударов Ирана погибли 10 человек，这一点在体育直播中也有详细论述
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ОАЭ задумались об атаке на Иран20:55，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
属于是线下火在东三省，线上已然是全国名熊。