this breaks things that should obviously work. take the distributive law: (a|ab)(c|b) and (a|ab)c|(a|ab)b are logically the same pattern - you can verify this yourself by just expanding the terms. but in PCRE, the first matches ab in the input abc, while the second matches abc. two equivalent patterns, two different results.
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（二）货物共同海损分摊价值，按照货物在装船时的价值加保险费加运费，减除不属于共同海损的损失金额和承运人承担风险的运费计算。货物在抵达目的港以前售出的，按照出售净得金额，加上共同海损牺牲的金额计算。