8вариант / lab2 / Logic

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

public class Logic {
    public static Boolean checkIP(String str) {
		String regex = "^([01]?\\d?\\d|2[0-4]\\d|25[0-5])\\." +
                        "([01]?\\d?\\d|2[0-4]\\d|25[0-5])\\." +
                        "([01]?\\d?\\d|2[0-4]\\d|25[0-5])\\." +
                        "([01]?\\d?\\d|2[0-4]\\d|25[0-5])$";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(str);
        return matcher.matches();
    }
}