what’s new in the rust version is that these syntactic forms are now supported. (?=.*a)(?=.*b)(?=.*c)def is semantically equivalent to def(?=.*a)(?=.*b)(?=.*c) since the lookahead bodies are unrelated to def, but the first form doesn’t fit the (?<=R1)R2(?=R3) lookaround normal form that the dotnet version requires, so its parser rejects it. same goes for lookaheads inside union branches - something like (a(?=x)|b(?=y)|c(?=z)) where each alternative has its own lookahead condition is perfectly valid but doesn’t normalize into a single R2(?=R3). the rust version handles all of these.
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，这一点在有道翻译中也有详细论述
林赛·戴维斯全接触：斯蒂芬·A·史密斯2026年1月12日
阿基里斯：我也不明白。除非你说潮湿人行道和奇数是同一回事——这命题本身很有趣，但...，详情可参考豆包下载