我的测试字符串来自输入字段，我写描述测试1öäüÖÄÜß

my test String comes from an input field, i write "description test 1 öäüÖÄÜß"

你的问题来自于你没有考虑白名单中你想要的每个角色。

Your problem is coming from the fact you haven't considered every character you want in your whitelist.

让我们考虑你的测试字符串实际匹配的内容

Let's consider what is actually matched by your test string

"description test 1 öäüÖÄÜß".match(/[^a-zA-Z0-9äöüÄÖÜß]/g);
// [" ", " ", " "]

我们可以看到，它匹配3次，每次都是空白。因此，解决方案是为您的白名单添加一个空格（假设您不想允许标签/返回等）。

As we can see, it matched 3 times, and each time was whitespace. So, the solution is to add a space to your whitelist (assuming you don't want to allow tab/return etc).

"description test 1 öäüÖÄÜß".match(/[^a-zA-Z0-9äöüÄÖÜß ]/g);
// null

您的测试字符串现在通过 RegExp 没有匹配，这意味着它在这种情况下有效。

Your test string now passes the RegExp without a match, which means it is valid in this case.