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