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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，这一点在PDF资料中也有详细论述
实际上，陕西联合与沣东的结缘不是今年才有的。在过去几年时间里，陕西联合球员的日常训练就在沣东足球公园，球员的宿舍就在沣东科统板块某小区，球队每次在足球公园的日常训练，都会引发众多球迷的围观。
Угрозу применения ядерного оружия в конфликте вокруг Ирана оценили14:57
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Фото: Алексей Сухоруков / РИА Новости，更多细节参见同城约会
future, and this time we .await it. In other words, we poll the second foo