formatPhoneNumber(event: any) {
// 입력값에서 숫자만 남기도록 처리하고 포맷 적용
let phoneNumber = event.target.value.replace(/[^0-9]/g, '');
if (phoneNumber.length === 11) {
phoneNumber = phoneNumber.replace(/(\d{3})(\d{4})(\d{4})/, '$1-$2-$3');
} else if (phoneNumber.length === 10) {
phoneNumber = phoneNumber.replace(/(\d{3})(\d{3})(\d{4})/, '$1-$2-$3');
}
// 포맷된 값을 다시 입력 필드에 설정
this.value = phoneNumber;
}