with occurs-check.
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.
Раскрыты траты россиян на путешествия в Международный женский день20:37，这一点在PDF资料中也有详细论述
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Birchall gave the answer "I don't recall" to Arnzen dozens of times in response to questions about meetings he was in regarding Twitter, conversations with Musk about the acquisition, and emails Birchall wrote and sent regarding the deal.，详情可参考电影
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