sanitize_text_field() stripping instances "%ca"

[lieutenantdan]

Forgive me if this isn't a bug, however I believe it is. But when you try to sanitize the string "%category%" with the WordPress native function sanitize_text_field() it will strip the "%ca" leaving the string "tegory%". Maybe this is a security precaution but it seems like something that should be fixed.

I found this while trying to simulate the custom permalink options in my own custom option and noticed anything containing "%ca" is removed.

Thanks for your time.

[playen]

This probably has to do with %CA being URL encoding for Ê
I came across the same issue in phpList