入门的正则表达式

验证手机号
public class Demo3 {
    public static void main(String[] args) {
        //校验手机号码, 邮箱,电话号码
        checkPhone();
        System.out.println("程序结束");
    }
    public static void checkPhone(){
        Scanner sc = new Scanner(System.in);
        do{
            System.out.println("请输入你的手机号码");
            String number = sc.next();
            if(number.matches("1[3-9]\\d{9}")){
                System.out.println("输入正确");
                break;
            }else{
                System.out.println("输入有误请重新输入");
            }

        }while(true);
}
=====================

public static void checkEmail(){
    Scanner sc = new Scanner(System.in);
    do{
        System.out.println("请输入你注册的邮箱");
        String number = sc.next();

        //判断邮箱格式是否正确  123456789@qq.com
        //判断邮箱格式是否正确  1234567dfg89s@163.com
        //判断邮箱格式是否正确  123456789@pci.com.cn

        if(number.matches("\\w{1,30}@[a-zA-Z0-9]{2,20}\\.([a-zA-Z0-9]{2,20}){1,2}")){
            System.out.println("输入正确");
            break;
        }else{
            System.out.println("输入有误请重新输入");
        }

    }while(true);
}

====================

一些方法

public class RegexDemo04 {
    public static void main(String[] args) {
        String names = "小路134sad蓉儿215sad过儿";
        String[] arrs = names.split("\\w+");//分割
        for (int i = 0; i < arrs.length; i++) {
            System.out.println(arrs[i]);
        }//小路 , 蓉儿. 过儿

        String name2 = names.replaceAll("\\w+"," ");//将//w+换成空格
        System.out.println(name2);

    }
}
===========================
爬虫基础

String rs = "来自黑马程序学习Java,电话020-43422424,或者联系邮箱" +
        "itcast@itcast.cn, 电话15730397976,020323322" +
        "邮箱bozai@qq.cn,400-100-3233, 4001003232";

//定义爬取规则
String regex ="\\w{1,30}@[a-zA-Z0-9]{2,20}\\.([a-zA-Z0-9]{2,20}){1,2}|" +
        "1[3-9]\\d{9}|" +
        "(0\\d{2,6}-?\\d{5,20})|" +
        "(400-?\\d{3,9}-?\\d{3,9})";

//2. 把这个爬取规则编译成匹配对象
Pattern pattern = Pattern.compile(regex);

//3.得到一个内容匹配器对象
Matcher matcher = pattern.matcher(rs);

//4.开始找了
while (matcher.find()){
    String rs1 = matcher.group();
    System.out.println(rs1);
}