Reading English from 1000 AD
调查显示，网民普遍认可养老托育等社会服务进社区、职工医保个人账户跨省共济、加强低收入群体兜底帮扶等为百姓切实带来生活便利的举措，同时期盼国家“逐步提高城乡居民基础养老金”“健全社会救助体系”，进一步织密扎牢民生保障网。
，推荐阅读heLLoword翻译官方下载获取更多信息
a very common use case for regexes is to find matches that are preceded or followed by some context. a classical example being all lines that end with ‘a’. this requirement is usually expressed with a lookahead, where upon finding an ‘a’, you look ahead to check if it’s the end of the line. in a backtracking engine, this is very easy to implement - you just duct-tape the logic that checks the next character, but in a DFA-based engine, this is impossible because you cannot report “the match is here” if the next character is not even known yet. and by the time you know the next character, the position information is lost, so you can’t report the match retroactively (well, unless the distance is fixed of course..).
This serial number check can be done using a simple local database at the Resource (website). Things get a bit more complicated if there are many Resources (say different websites), and you want to prevent credential re-use across all of them. The typical solution outsources serial number checks to some centralized service (or bulletin board) so that a user can’t use the same credential across many different sites.