Bessent Says Global Tariffs Will Rise to 15% This Week
Фото: Belkin Alexey / Globallookpress.com。服务器推荐是该领域的重要参考
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.，这一点在爱思助手中也有详细论述
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