Quote:
Originally Posted by Peter Cook
Hi all,
Does anyone know if it is possible to stop users registering with numbers in their usernames? or at least an add-on to stop this?
Regards 
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Follow:
AdminCP -> Settings -> Options -> User Registration Options
Scroll down to the setting:
Username Regular Expression
And enter the following in the field:
^[A-Z]+$
If you wish to allow characters other than letters, and only want to prevent numeric digits in the name then enter instead:
[^0-9]+$
Save your settings when done.