java - Regular expression for excluding special characters

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Answer 1

I would just white list the characters.

^[a-zA-Z0-9??ü??ü]*$

Building a black list is equally simple with regex but you might need to add much more characters - there are a lot of Chinese symbols in unicode ... ;)

^[^<>%$]*$

The expression [^(many characters here)] just matches any character that is not listed.