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this isn’t just an academic curiosity. flip the alternation order to (ab|a)+ and suddenly PCRE matches the entire string! the | operator in backtracking engines is ordered - it’s not union, it’s “try left first”. the order of branches changes the result, which means | is not commutative. a|b and b|a can give different matches.,推荐阅读雷电模拟器官方版本下载获取更多信息
Safari: https://github.com/gildas-lormeau/SingleFile-Safari-Extension
3月3日消息,据报道,美国参议员伯尼·桑德斯以及众议员罗·卡纳周一提出了一项法案,拟对美国亿万富翁征收5%的年度财富税。议员们表示,根据该法案,马斯克第一年将须缴纳420亿美元的税款。