CB Conditional hide required field

Hi,
on my registration page I want to display a required field, if the email address of the person who signs up matches a regex.
Hiding the field works fine, but I also want, that field not to be not required, if it's hidden, because now, users whose email addres does not match the regex, can't sign up anymore, since there is a hidden required field. How can i solve this problem?

CB Conditional handles required state of hidden fields. You should not be getting a validation error for the field hidden by CB Conditional. Are you sure that field specifically is causing a validation error and not something else?

you are right, must have been some caching issue even though cache was disabled. I emptied the cache manually and tried again, and it worked.
I apologize for the inconvenience...