Greedy Reluctant Possessive区别

<span style="font-size:14px;">package cn.itcast.test;

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

//Greedy  Reluctant   Possessive区别
public class Demo3 {
  
  public static void main(String[] args) {
    /*  //Greedy   (.{3,10})[0-9]  -->一般使用这个
    //先把s吞取10个字符再说,与模式串进行匹配,匹配失败,把最后一个吐出来,吐出来的正好是数字,正好匹配,所以输出0-10
    Pattern p = Pattern.compile("(.{3,10})[0-9]");
    String  s = "aaaa3bbbb6";
    Matcher m = p.matcher(s);
    if(m.find()){
      p(m.start()+ "-" + m.end());
    }else{
      p("not match");
    }*/
    
    /*//Reluctant (.{3,10}?)[0-9]
    //这个与Greedy正好相反 吞最少的  正好结果为0-5
    Pattern p = Pattern.compile("(.{3,10}?)[0-9]");
    String  s = "aaaa3bbbb6";
    Matcher m = p.matcher(s);
    if(m.find()){
      p(m.start()+ "-" + m.end());
    }else{
      p("not match");
    }*/
    
    // Possessive  与Greedy 不同的是,它不吐字符,这个匹配不上
    Pattern p = Pattern.compile("(.{3,10}+)[0-9]");
    String  s = "aaaa3bbbb6";
    Matcher m = p.matcher(s);
    if(m.find()){
      p(m.start()+ "-" + m.end());
    }else{
      p("not match");
    }
    
    
    
  }

  private static void p(Object o) {
    System.out.println(o);
  }
}
</span>