How can I limit specific characters on username?

Question

Hi,

I am using 1.5 version of this script and wanted to limit A-Z, a-z, 0-9 and underscore for username while registering or modifying profile. In the default installation of the script, I see user can have spaces on their username which definatly doesn't make any sense.

So, can anyone suggest me how to implement such feature or what exactly I need to change?

Answer 1

You can do this using a plugin with a filter module which implements the filter_handle(...) method.

Comments

So, I have to create my own custom plugin for that or does such plugin already exist?