User regex always saying invalid

[Satal]

I'm currently trying to restrict the characters that user's can out in their usernames.

I'm trying to restrict to just
Code:

^[a-zA-Z0-9_\-]$
which doesn't appear to work but even when I try
Code:

^[a-zA-Z0-9]$
(suggested here) I get the same error message.



I have tried making this change from both my desktop and phone, admittedly Chrome on both. Logged out of...

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