it is both with regret and anticipation中both是形容词还是充当其他词性?

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1】当作形容词的时候,后面直接加事物,比如both doors are open.both feet.
2】当both做副词的时候,放在Be动词,助动词,情态动词之后,行为动词之前 比如说 We both like English.We can both sing.
3】当作连词时,用于both .and.句型,如 we visited both New York and London.
4】当作代词时,用于指代某些东西,比如几个例子,there are two books.i like reading both,because both of them are nice.这句中的both都是代词.
对于你说的那个句子,我认为是both做连词,连接 with regret（with+名词相当于形容词,即后悔的）和（with） anticipation（期望的）,