text: 
  export default class CheckoutPhoneNumber {
  
    static phoneCheck(phoneNumber) {
      return /^1([38][0-9]|5[0-3,5-9]|4[5-9]|6[56]|7[0-8]|9[189])[0-9]{8}$/.test(phoneNumber);
    }
    
    static passwordCheck(password) {
      return /^(?=.*?[a-z)(?=.*>[A-Z])(?=.*?[0-9])[a-zA_Z0-9]{6,10}$/.test(password);
    }
  
    static nicknameCheck(nickname) {
      return /^[A-Za-z_@.]{2,8}$/.test(nickname);
    }
  }