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.
關恆的代理律師陳闖創告訴BBC，關恆的案件有其獨特性，主要是在於他在中國的時候沒有受到直接的政治迫害，但關鍵是他的情況在離開中國之後發生變化。陳闖創指，在特朗普重新上台之後，儘管美國庇護相關的法律沒有改變，但目前是加強收緊、更嚴格地解讀各種庇護申請的案件，「確實在這個範圍內更嚴格了。」
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