This add-on allows your members to use a dynamic avatar, it is a color background with the first letters of the username.
With 2 letters:
With 1 letter:
You can select the font used and the number of letters to display.
You can add an unlimited number of background colors and color...
I was trying to today to test the (User Name Match Regular Expression) option on XF.
My forum is an Arabic one so I was trying to add a regex expression to allow the registration with Arabic letters only,
I used the following: