What specific Regex does Castle Validator ValidateEmail use?

Question

I have two interacting systems in one we are using Castle Validator for our validation, the other is coded by hand, I need to ensure the email validation between these two systems is a match; the problem is I have not been able to find documentation of the Regex that castle uses for email.

There is this question but the links provided are all dead.

Answer 1

After looking through the repo history I was able to find the regex (separated into multiple lines for readability):

^([a-zA-z0-9_\-\.\'\+]+)
@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))
([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$

A side note: this regex is still pretty broken with how the @[ipaddress] is allowed.

For example this: johndoe@mydomain.111] is registered as valid as would this: johndoe@[111.111.111.com