SplitString

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

public class SplitString {
    public static void main(String[] args) {
        String s = "ABCD";
        s += "12345678901234567890123456789012345678901234567890";
        s += "12345678901234567890123456789012345678901234567890";
        s += "12345678901234567890123456789012345678901234567890";
        s += "12345678901234567890123456789012345678901234567890";
        s += "12345678901234567890123456789012345678901234567890";
        s += "EFGH1234";
        s += "ABCD";
        s += "12345678901234567890123456789012345678901234567890";
        s += "12345678901234567890123456789012345678901234567890";
        s += "12345678901234567890123456789012345678901234567890";
        s += "12345678901234567890123456789012345678901234567890";
        s += "12345678901234567890123456789012345678901234567890";
        System.out.println("Before:");
        System.out.println(s);
        s = s.replaceAll("ABCD\\d{250}", "\n$0\n");
        System.out.println("After:");
        System.out.println(s);
        Scanner in = new Scanner(s);
        Pattern p = Pattern.compile("ABCD\\d{9}(\\d{16})(\\d{16})");
        while (in.hasNextLine()) {
            Matcher m = p.matcher(in.nextLine());
            if (m.find()) {
                System.out.print("1: ");
                System.out.println(m.group(1));
                System.out.print("2: ");
                System.out.println(m.group(2));
            }
        }
        in.close();
    }
}