How to filter Mathematical Alphanumeric Unicode characters in Word Filter?

[ciaoamigos]

Hello everyone,

I'm looking for advice on how to configure the SmartFoxServer Word Filter to block messages containing mathematical Unicode characters—specifically the Mathematical Alphanumeric Symbols range (U+1D400–U+1D7FF).

I tried adding a regex like:

Code: Select all

(?:\uD835[\uDC00-\uDFFF])

But it doesn’t seem to work, and even adding the fancy characters directly to the filter is not effective in all cases.

Question:
Is there a way (with regex or otherwise) to configure the Word Filter to block any message containing Mathematical Alphanumeric Symbols (U+1D400–U+1D7FF), or is it necessary to manually add every possible variant for each word?

Any tips or best practices on how to handle Unicode “fancy” characters in the Word Filter would be greatly appreciated!

[Lapo]

I am no regex expert but I would recommend googling how to do that in Java.

You can also use this site:
https://regex101.com/
to test the regexp, it supports all kinds of languages.

Cheers