使用preg_match检查电子邮件域

Question

如何修改下面的preg_match函数以允许所有以harvard.edu电子邮件地址结尾的电子邮件地址，而不仅仅是@ college.harvard.edu的电子邮件地址？

if(!preg_match("/@college\.harvard\.edu$/", $_POST["username"]))
    {
        apologize("You must provide a Harvard email to register.");
    }  

Answer 1

if(!preg_match("/@.*harvard\.edu$/", $_POST["username"]))
{
    apologize("You must provide a Harvard email address to register.");
}