正则表达式(二)

public static void main(String[] args) {
        String ss = ",一@CNUM,一斤@CQUAN,斤@COUNT,1点1@CNUM,1点1斤@CQUAN,斤@COUNT,西安@CN_ADJ,优质@CN_ADJ,大白菜@CN_WORD,";
        Matcher m = Pattern.compile(",.*?@CQUAN").matcher(ss);
        while(m.find()){
            System.out.println(m.group());
        }
    }

输出:

,一@CNUM,一斤@CQUAN
,斤@COUNT,1点1@CNUM,1点1斤@CQUAN

一个明确的字符,从最左边第一个匹配到的字符开始, 贪婪和懒惰匹配针对的是数量词字符,如

 * 或 + 或 ? 或 {n} 或 {n,} 或 {n,m} 

 

public static void main(String[] args) {
        String ss = ",一@CNUM,一斤@CQUAN,斤@COUNT,1点1@CNUM,1点1斤@CQUAN,斤@COUNT,西安@CN_ADJ,优质@CN_ADJ,大白菜@CN_WORD,";
        Matcher m = Pattern.compile(",[^,]*?@CQUAN").matcher(ss);
        while(m.find()){
            System.out.println(m.group());
        }
    }

输出

,一斤@CQUAN
,1点1斤@CQUAN

再举个例子

public static void main(String[] args) {
        String ss = "232456778";
        System.out.println(ss.replaceAll("2.*7",""));
        System.out.println(ss.replaceAll("2.*?7",""));
    }

输出

8

78