正则表达式的用法 例子

package cn.zmh.正则;

public class RegexDemo {
    public static void main(String[] args) {
        checkMail();
        split_2();
        split_1();
    }
    //邮箱
    public static void checkMail(){
        String email = "15524562548@163.com";
        boolean b = email.matches("[a-zA-Z0-9]+@[0-9a-z]+(\\.[a-z]+)+");
        System.out.println(b);
    }
    //  19     89    12
    public static void split_2(){
        String st = "19  89  12";
        String[] s = st.split(" ");
        System.out.println("长度为"+s.length);
        for(int i=0;i<s.length;i++){
            System.out.println(s[i]);
        }
    }
    // String split()
    public static void split_1(){
        String st = "2019-03-19-10-51";
        //按照-对字符串进行切割
        String[] stArr = st.split("-");
        System.out.println("长度为："+stArr.length);
        for(int i=0;i<stArr.length;i++){
            System.out.println(stArr[i]);
        }
    }
}