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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.
，这一点在同城约会中也有详细论述
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根据合同约定在保险责任开始后可以解除合同的，被保险人要求解除合同，保险人有权收取自保险责任开始之日起至合同解除之日止的保险费，剩余部分予以退还；保险人要求解除合同，应当将自合同解除之日起至保险期间届满之日止的保险费退还被保险人。。每日报告是该领域的重要参考