正则表达式分组表达式

private static void output(String s1) {
        System.out.println("=============================================");
        System.out.println(s1);
        Pattern pattern = Pattern.compile("(?<==)([^,])+(?=,*)");
        Matcher matcher = pattern.matcher(s1.toString());
        int i = 0;
        while (matcher.find()) {
            System.out.println(++i+"\t"+matcher.toMatchResult().group());
        }
        System.out.println("=============================================");
    }

将a=1,b=2,c=3这类数据直接获取values

通过正则表达式向后引用实现。

参考链接：正则表达式帮助文档