validate email

app/models/user.rb

@@ -56,6 +56,8 @@ class User < ApplicationRecord
   FULL_EMAIL_REGEXP =
     /\A[a-z0-9][.']?(?:(?:[a-z0-9_-]+[.+'])*[a-z0-9_-]+)*@(?:[a-z0-9]+[.-])*[a-z0-9]+\.[a-z]{2,}\z/i
 
+  VALIDATE_EMAIL_REGEXP = /\A[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\z/
+
   has_one_attached :signature
   has_one_attached :initials
 
@@ -78,7 +80,7 @@ class User < ApplicationRecord
   scope :archived, -> { where.not(archived_at: nil) }
   scope :admins, -> { where(role: ADMIN_ROLE) }
 
-  validates :email, format: { with: /\A[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\z/ }
+  validates :email, format: { with: VALIDATE_EMAIL_REGEXP }
 
   def access_token
     super || build_access_token.tap(&:save!)