How can I enable special characters (like @) in usernames, passwords?

DMA Radius Manager

Edit the appropriate regexp string in /var/www/radiusmanager/config/system_cfg.php
and add the special characters You need:

change
define('regexp_username', '/^[a-z0-9._]+$/'); // regular expression for validating user names

To
define('regexp_username', '/^[a-z0-9._@]+$/'); // regular expression for validating user names

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