. 在和实际上意味着

除换行符外的所有字符.(来源)

All but a line break character. (source)

用[\S\s]代替，表示

所有空格字符和所有非空格字符；所以所有字符.

All spacing characters and all non-spacing characters; so all characters.

然后它似乎起作用了.您可以使用其他变体，例如 [\W\w]、[\D\d]、...

Then it seems to work. You could have used other variants like [\W\w], [\D\d],...

所以正确"的正则表达式(请不要相信我的话，首先测试一下)是:

So the "correct" regex (please don't take my word for it, first test this) is:

^((?!([\w!#$%&'*+\-/=?\^_`{|}~]+(\.[\w!#$%&'*+\-/=?\^_`{|}~]+)*@((([\-\w]+\.)+[a-zA-Z]{2,4})|(([0-9]{1,3}\.){3}[0-9]{1,3}))))[\S\s])*$

regex101 演示.