Java 이메일 체크 정규식

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) {
        String[] emails = {"godseun.tistory.com", "godseun@tistory.com", "", "한글@이멜.com"};
        String regex = "^[_a-z0-9-]+(.[_a-z0-9-]+)*@(?:\\w+\\.)+\\w+$";
        Pattern p = Pattern.compile(regex);
        
        for (String email : emails) {
            Matcher m = p.matcher(email);
            System.out.println(m.matches()); //print false, true, false, false
        }
    }
}