public class ZhengZe {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        //使用正则进行匹配
        String mail="lishuai_zhangsan@qq.com.com.cbn";
        String regex="\\w+@\\w+(\\.+\\w+){1,3}";
        boolean boo=mail.matches(regex);
        System.out.println(boo);
        //切割字符串
        String str="aaa?dad？？？？？？frad????？？？？？？？？;afaaf、？ADafa";
        //使用叠词来切割时需要使用正则
        String[] s=str.split("(.)\\1+");
        for (String string : s) {
            System.out.println(string);
        }
    }

}