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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.
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《死侍与金刚狼》的编剧雷特·瑞斯看过这段视频后，在社交媒体上发出悲观的感叹：