Replacing all non-alphanumeric characters except some characters

Question

I want to replace all non-alphanumeric characters, but keep Æ, Ø, Å, æ, ø, å.
Current code:

  replaceAll("\\P{Alnum}", "_")

Answer 1

Use explicit white list instead:

replaceAll("[^a-zA-Z0-9ÆØÅæøå]","_")

Look at the similar question

Answer 2

以下对您有用吗？

 replaceAll("[^A-Za-z0-9ÆØÅæøå]", "_")

Answer 3

试试这个：

replaceAll("^[a-zA-ZÆØÅæøå]*$", "_");