Hello,
I would liket to apply the following pattern [a-z0-9] (or [:alnum:]) to an extrafiels of my Third Parties (string where I want to accept only letters and numbers - The goal is to use this extra field to build URLs that’s why I cannot affort letting the user recording special characters like “space” for example there).
Anyone have an idea how we can adress this need?
Thank you for your help! 
Regards,
