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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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因被保险人故意，未申报或者错误申报运输货物的，对于该次货物运输发生海上保险事故造成的损失，保险人不承担赔偿责任，但是有权收取保险费。
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