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求php正则表达式，不能以字符串abc或xyz结尾如果是单个，不能以字符串abc结尾应该是：([^abc]$/i)吧？
([^abc]$/i)
/^(?!.*abc$)(?!.*xyz$)/
[]这个结构的意思是里面的元素都是每个小分支呀所以题主所说的[^abc]$/i是不严格的，比如，
[]
[^abc]$/i
/[^abc]$/i.test("xxxab"); //false 实际上你希望得到true
/.*?[^(abc|xyz)]$/i
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
/^(?!.*abc$)(?!.*xyz$)/[]这个结构的意思是里面的元素都是每个小分支呀所以题主所说的
[^abc]$/i是不严格的，比如，