class User < ApplicationRecord
    has_secure_password
    validates :username, format: {with: /\A[a-zA-Z0-9_]{2-20}\z/,message: 'Ne doit contenir que des caractères alphanumériques'},
     uniqueness: {case_sensitive: true}
    validates :email, format: {with: /\b[A-Z0-9._%a-z\-]+@(?:[A-Z0-9a-z\-]+\.)+[A-Za-z]{2,4}\z/, message: "Votre E-mail n\'est pas valide"},
    uniqueness: {case_sensitive: true}
end