Need help with Regex using notepad++. I have a data set with emails similar to this:

I'm using this code to search for the emails:

My issue is that I need to format the emails to be uppercase up to the @ symbol and lowercase after the @ symbol. I can make the whole email uppercase using \U\1 but I need help with only making the names up to the @ symbol upper and everything after @ lower case.

Thanks for any help