PHP，验证用户是否输入了电子邮件域，不是地址

Question

I was looking for this answer, but I was not able to find this exact variation.

I'm looking for the following to validate:

#1)  @toysrus.com
#2)  @staples.com
#3)  @example.com

And the following NOT to validate:

#1)  staples.com
#2)  [e-mail]
#3)  @testcom

Basically, I want to force the user to enter a valid email domain, NOT an email address. Any clue how I could go about this?

I guess alternatively ask a user for their website domain name and just append the '@' character to that, but it's more confusing. It would be easier to simply to ask the user, please enter your company email domain name.

Thanks!

Answer 1

You can use the regular expression to match the email domain name. For example:

$pattern = "^@(\w)+((\.\w+)+)$";
if (preg_match($pattern,$domain))
    echo "Domain name right"

"^@" means the string should start with "@"."(\w)+" match at least 1 number or letter."(.\w+)+" match at least 1 domain name,such as ".com" or ".edu.cn". "$" means the end of the string.