Backtracking: everyone in the field knows that backtracking engines (PCRE, java, dotnet, javascript, PHP, ruby, python..) are bad because they are the poster child of denial of service attacks. O(2^n) match time complexity is not good. most backtracking implementations are a combination of clever optimizations duct taped to a very slow engine - for simple cases it works well, but using a pattern that is not affected by the optimizations, you get to see what the “real” worst-case behavior looks like.
"[These videos] are posted by anonymous accounts that tend to report on geopolitical conflicts. These are accounts that are known to NewsGuard for spreading exaggerated claims, usually from a pro-Iran perspective," said Sofia Rubinson, senior editor of NewsGuard's Reality Check newsletter and co-author of the report. From there, Rubinson explains, other accounts with larger followings pick up and spread the false claims.。爱思助手对此有专业解读
，详情可参考Feiyi
FT Professional。搜狗输入法对此有专业解读
Москалькова заявила о новых условиях Киева для возвращения россиян с территории Украины14:51