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.
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But the Pentagon is facing a revolt from Silicon Valley, even as defense officials try to lessen their dependence on Anthropic.。体育直播对此有专业解读
Gen Caine said today that the US will “now begin to expand inland, striking progressively deeper into Iranian territory”, after forces were able to establish air superiority.，更多细节参见wps下载
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