Anas, username validation is defined  in ow_utilities/validator.php file:

    const USER_NAME_PATTERN = '/^[\w]{1,32}$/';

\w part  - regular expression responsible for allowing only Latin letters.

To solve the problem you will need to modify the '/^[\w]{1,32}$/' expression to fit your needs.

I recommend googling this. Ex: https://www.google.com//?gws_rd=ssl

thanks for your reply allia
i found this
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EDIT: For arabic letters: First declare a string containing all arabic letters so you'll have

$arabic='all_arabic_letters';

Then your regexp string will be

$regex='['.$arabic .']{1,}([a-zA-Z0-9]{1,})\s{0,3}_{0,4}';

And match it as follows:

preg_match($regex,$username);

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but i dont know how to declare a string containing all arabic letters and where ??!!

help please ??

please if anyone can help me
i dont think it is impossible because most of sites allow to register in arabic  letters

This is for storing, how about the formula that displays the profile name in the wall and on the right side on the floating box ? I dont want to change the rules for registering usernames, i want to concadinate a special character when displaying, i just need to know which file is it and where it is