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.
«Европа бьет сама по себе». Страну НАТО заподозрили в организации атаки на российский газовоз. Новые подробности атаки на судно20:45
，详情可参考safew官方下载
В Иране издали фетву о джихаде с призывом пролить кровь Трампа20:58，这一点在谷歌浏览器【最新下载地址】中也有详细论述
Apple says 14-inch and 16-inch MacBook Pros with M5 Pro will see:，更多细节参见体育直播
Linda Cardellini in "DTF St. Louis."