Regex on Registration ...

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I have a regex on the usernames for registering, while this works, the response for something that doesn't fit my regex says already registered !

:cross-eyed: is there a way I can change this as I can't see a regex reference in register.php.

I am also trying to force only certain types of email address i.e. all at one domain with the same regex on the user portion.

Any help is greatly appreciated.