from ncpu.model import CPU
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.
，更多细节参见下载安装汽水音乐
Bats in Churches
Skip content and continue reading台灣電影《世紀血案》為何引發抵制潮？2026年2月10日
Copyright © ITmedia, Inc. All Rights Reserved.