Java 7 中的正则表达式命名捕获组支持

Java
import Java.util.RegEx.Matcher;
import Java.util.RegEx.Pattern;
public class NamedCaptureGroupExample {
    public static void mAIn(String[] args) {
        String date = "2021-01-01";
        String RegEx = "(?<year>\\d{4})-(?<month>\\d{2})-(?<day>\\d{2})";
        Pattern pattern = Pattern.compile(RegEx);
        Matcher matcher = pattern.matcher(date);
        if (matcher.matches()) {
            String year = matcher.group("year");
            String month = matcher.group("month");
            String day = matcher.group("day");
            System.out.println("Year: " + year);
            System.out.println("Month: " + month);
            System.out.println("Day: " + day);
        }
    }
}