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.
周健工：我觉得第一个是，DeepMind和Google Brain的合并，是2023年4月份。当时谷歌内部进入了一个据说是危机的状态，连另外一个创始人谢尔盖-布林（Sergey Brin）都回来上班了，跟大家一起看代码、看数据、看模型。
。safew官方版本下载是该领域的重要参考
Турция сообщила о перехвате баллистического снаряда из Ирана14:52。谷歌浏览器【最新下载地址】对此有专业解读
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Антонина Черташ