almost every regex engine today descends from one of two approaches: Thompson’s NFA construction (1968) or backtracking (1994). Thompson-style engines (grep, RE2, Rust’s regex) give you linear-time guarantees but only support the “standard” fragment - | and *. backtracking engines (the rest, 95% chance the one you’re using) give you a mix of advanced features like backreferences, lookarounds.., but are unreliable, and can blow up to exponential time on adversarial inputs, which is a real security concern known as ReDoS. to be more precise, this exponential behavior is not the only problem with backtracking engines - they also handle the OR (|) operator much slower, but let’s try to start with the big picture.
看到画面里两个“贾樟柯”对话，有种奇妙的穿越感。
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过去很长一段时间，电动车在面对这“三座大山”时，多少显得有些底气不足。要么为了续航堆电池，结果车身沉重、充电更慢；要么为了快充牺牲电池寿命，冬天一到，续航达成率往往要靠“黄金右脚”来维持。高性能、长续航、快充，三者似乎总得舍弃一个。，这一点在搜狗输入法中也有详细论述
Amanda Silberling，这一点在safew官方下载中也有详细论述