Question

I have a registration form that users fill with their email address (and password).

The web framework I am using (Symfony) lets me specify a regular expression for an email address to be “good-to-go”.

I want to block some domains that are just spammers, let’s say:

example1.com  example2.com

So I need a regex that means: “accept everything but email addresses from those domains”

How can I put together the regular expression for that?

I tried with:

/!(@(examples1\.com|example2\.com)$)/

But it doesn’t do what it is supposed to do.

Can somebody help, please?

Answer 1

Symfony allows you to do both positive and negative regular expression validators. You’ll want to do a negative one.

sfRegexValidator:
  match:        No
  match_error:  Email addresses from that domain are not allowed
  pattern:      /@(examples1\.com|example2\.com)$/si