Calculation if letter matches regular expression?

Question

So, I'm trying to determine if someone is using a temporary email made by our system. If a user tries to log in using a social account (Twitter / Facebook) and they deny access to email, I generate an email for our system, which is [e-mail] or [e-mail] , so an example will be 123456789 @facebook. com This is a temporary email until the user enters a real email address. I am trying to compare this with a regex.

    if (preg_match("/^[0-9]@twitter.com/", Auth::user()->email, $matches)) {
    }

However, I think my regex is wrong. How to check if string format is N Number of digits followed by @ twitter.com or @ facebook.com

Answer 1

How to check if string format is N Number of digits followed by @[e-mail]

You can use this regex:

'/^\d+@(?:facebook|twitter)\.com$/'

You use ^[0-9]@one that will have only one digit at startup. In addition, DOT is a special regular expression character that must be avoided. Also, pay attention to using the end anchor $in your anchor to avoid matching unwanted input.

Answer 2

ID :

    if (preg_match("/^[0-9]+@(twitter|facebook)\.com/", Auth::user()->email, $matches)) 
    {
       //Your code here
    }