我有一个保存日期的varchar2字段。如何检查格式？

import re

date_string = "2022-01-01"
pattern = r"^[0-9]{4}-[0-9]{2}-[0-9]{2}$"

if re.match(pattern, date_string):
    print("日期格式正确")
else:
    print("日期格式错误")

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

String dateString = "2022-01-01";
String pattern = "^[0-9]{4}-[0-9]{2}-[0-9]{2}$";

Pattern regex = Pattern.compile(pattern);
Matcher matcher = regex.matcher(dateString);

if (matcher.matches()) {
    System.out.println("日期格式正确");
} else {
    System.out.println("日期格式错误");
}