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EMAIL_REGEX = /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]+)\z/i

validates :email, uniqueness: { case_sensitive: false }, format: { with: EMAIL_REGEX }
validates :first_name, :last_name, :email, presence: true

validates :amount, presence: true, numericality: true
before_save :downcase_fields

def downcase_fields
  self.email.downcase
end