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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.，详情可参考旺商聊官方下载
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The key-control room at the jail, where Friedmann’s infiltrations were first detected.Photograph by Dan Winters for The New Yorker
Note also that the target setting would not be a promise，这一点在同城约会中也有详细论述