If you have ever dealt with a membership site you know there are always users who want to use an inappropriate username. Sometimes containing foul language or even trademark words. In this video, we will show you how to restrict usernames in WordPress.
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Summary of this Tutorial:
Start by installing and activating the Restrict Usernames Plugin.
This will add a new option under Users called “Name Restrictions”.
Simply add a list of restricted usernames or keywords in partial matching.
If a user attempts to register with a restricted username they will get an error.
This plugin will not modify any existing user.
Restrict Usernames plugin