java中正则表达式

package cn.lijun.demo1;

public class RegexDemo {

    public static void main(String[] args) {
        //checkPhone();
        checkQQ();
    }
    //验证手机号码是否正确
    public static void checkPhone(){
        String phoneNum="13721827814";
        boolean b=phoneNum.matches("1[0-9][\\d]{9}");
        System.out.println(b);
    }
    public static void checkQQ(){
        String qq="2010634510";
        boolean b=qq.matches("[1-9][\\d]{4,9}");
        System.out.println(b);
        }
//邮箱
    public static void checkMail(){
        String email="[e-mail]";
        boolean b=email.matches("[\\w]+@[0-9a-z]+(\\.[a-z]+)+");
        System.out.println(b);
    }
    //分离空格
    public static void split_2(){
        String str="19    89    12";
        String[] strArr=str.split(" +");
        System.out.println("数组的长度是："+str.length());
        for(int i=0;i<strArr.length;i++){
            System.out.println(strArr[i]);
        }
    }
    public static void split_1(){
        String str="2019-03-19-10-51";
        //按照-对字符串进行切割
        String[] strArr=str.split("-");
        System.out.println("数组的长度是："+strArr.length);
        for(int i=0;i<strArr.length;i++){
            System.out.println(strArr[i]);
        }

}