[SOLVED] How to restrict user name fields

Should I change hte Perl regular expression to something else?

Your REGEXP isn't strict enough. You'd need to use the below.

/^[a-zA-Z0-9]+$/

Or should I change the authorized input to single a-z,A-Z,0-9,_ word?

That would be the easier approach as all those characters should be valid for Moodle as well.

Ok thanks for the fast reply, I have changed it to the single word setting as it is easier. I assume it should now be resolved.

Thanks again!