java正則表達式 分段解析字符串使用（.*？）(?=)

例子：

package com.h3c.pattern;

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

public class Test {

    public static void main(String[] args) {
         /*String filetext = "//@張小名: 25分//@李小花: 43分//@王力: 100分";  
            Pattern p = Pattern.compile("\\@(.*?)\\:");//正則表達式，取=和|之間的字符串，不包括=和|  
            Matcher m = p.matcher(filetext);  
             while(m.find()) {  
                    System.out.println(m.group(0));//m.group(1)不包括這兩個字符  

               }  */




        String info = "Subslot 1: \r\nsdfas fsfafsfsf\r\n Subslot 2:sd \r\nf6asf4sfsf5s4f2s\r\n Subslot 3: 5154dsfa5sfd4sa5f <s14sdfsf54sf>";
        //String reg = "((Subslot \\d.*)((Subslot \\d)|(<.*>)))";
        String reg = "(Subslot\\s*\\d(.*?)((?=(subslot\\s*\\d+))|(?=(\\s*<))))";

        Pattern p = Pattern.compile(reg,Pattern.DOTALL|Pattern.MULTILINE|Pattern.CASE_INSENSITIVE);    
        Matcher m = p.matcher(info);    
        while (m.find()) {  
            System.out.println("--------------");
            System.out.println(m.group());
            System.out.println("0:"+m.group(0));
            System.out.println("1:"+m.group(1));
            System.out.println("2:"+m.group(2));
            //System.out.println("3:"+m.group(3));
            //System.out.println(m.group(4));
        }   
    }

    public void pattern(){
        String digitNumStr = "11A11、22A22、33A33、44B44、55B55";
        //String digitNumStr = "11A11";
        Pattern digitNumP = Pattern.compile("(?<twoDigit>\\d{2})[A-Z]\\k<twoDigit>");
        Matcher foundDigitNum = digitNumP.matcher(digitNumStr);

        // Find all matches
        while (foundDigitNum.find()) {
          // Get the matching string
          String digitNumList = foundDigitNum.group();
          System.out.println(digitNumList);
        }
    }


}