the biggest gain from & and ~ is that they let you mix and match regexes. instead of writing a single spaghetti monster regex that tries to do everything, you can break it down into smaller, simpler pieces and then combine them with boolean operators. this makes your regexes easier to read, write and maintain. this is best illustrated in the web app that came with the paper (https://ieviev.github.io/resharp-webapp/) where you can visually see how the different components of a regex are combined, and how they contribute to the final match.
Кадр: МЧС России，详情可参考Safew下载
По мнению Бласа, власти США прекрасно понимают, что разблокировать пролив нужно как можно быстрее. Не исключено, что танкерам, идущим через пролив, придется предоставить военный эскорт. Последний раз до такого доходило в середине 1980-х годов.，更多细节参见体育直播
But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.
id x = x get a concrete type at each use site.