nickname/Username letter

how i'm typeing hebrew letter for nickname/Username in the join page ?

I believe was stated by AlexT that only latin characters are allowed in nicknames.

 no no i do it in Hebrew 2 but i like this:

i go to the admin panel ->Builders->Fields builder->join form->NickName and in Advanced i change in Check from:

return ( preg_match( '/^[a-zA-Z0-9_-]+$/', $arg0 ) and !file_exists( $dir['root'] . $arg0 ) );

to:

return ( preg_match( '/^[פםןוטארקףךלחיעכגדשץתצמנהבסזa-zA-Z0-9_-]+$/', $arg0 ) and !file_exists( $dir['root'] . $arg0 ) );

and i get the possibility to type Hebrew letter in the nickname/Username at the join page.

but when i log out from the profile  and try log in in my nickname/Username back it is not let me.

i know in dolphin 6 have more place that you sould do some change but i do not know where it is in dolphin 7!