RoR Copy Devise Using Old Regex

I'm not too savvy with Ruby on Rails, but I know enough that I was able to copy my app into a slightly altered duplicate. Almost everything is going fine with the new copy except that my user email regex is still using the older copy's user email regex.

I'm trying to figure out which part calls devise.rb in the initializers, but so far I have had no luck. I've also had a hard time finding if others have had this problem and solved it.