You're welcome
You can look here and then you can add the character you want:
"regex(., '[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}')" this link is very helpful.
So, you could use regex(., “^[A-Z (.*]{1,100}$”) notice that I added space between Z and the parenthesis ( .
Thank