我正在尝试理解以下正则表达式,它将域名从URL中提取出来
$host = "www.php.net“
// get last two segments of host name
preg_match('/[^.]+\.[^.]+$/', $host, $matches);
echo "domain name is: {$matches[0]}\n";
$matches作为php.net怎么样了?
我被这种模式卡住了。^的意思是免费的。意思是任何焦炭。那么是什么呢。卑劣?免费赠送什么焦炭吗?请帮帮忙
package bank.vip.or.np;
import java.util.Scanner;
public class BankVipOrNp {
public static void main(String[] args) {
// this is a programm for a bank to determine whether the customer is vip or np
Scanner input = new Scanner (System.in);
double [] balance = new double