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.
周健工：这又回到刚才谈到的哈萨比斯和大卫·西尔弗对强化学习的执念。DeepMind研究的项目组合，哈萨比斯亲自讲过的。他给外人感觉是非常包容、非常跨学科的，但是他还是有先后顺序的。他第一，我们认为强化学习就是通向AGI的，这是我们的重中之重；第二，就是神经科学，向人的大脑学习；第三才是从数据中去归纳。而且大语言的模型是在数据归纳里面的一个分支。所以大语言模型是排在第三位里面的一个分支，足见他是非常不重视的。
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