我需要一个否定的前瞻表达式,但我不能让它工作:(我希望有人可以帮助我。我需要一个表达式,直到样本中的任何地方都不包含 2 个单词。例如 2 个单词pie
donuts
:
i sure like eating pie, but i love donuts very much
---> false
i sure like eating but i love donuts very much
---> true
i sure like eating pie, but i love hamburger very much
---> true
i sure like eating donuts, but i love pie very much
---> false
i sure like eating piedonuts very much
---> false
我已经尝试过多种形式,但它不起作用。