How only allow these characters in username?

Question

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I have problems with special characters =(

More information: http://www.question2answer.org/qa/48654

Answer 1

Create a filter plugin, see http://www.question2answer.org/qa/27723/dont-allow-people-to-register-with-some-usernames-like-admin

For your specific case you probably want a regex like

/[^A-Za-z0-9]/

If you match that, it means there is a non-alphanumeric character in there.

Comments

Please add this function in core 1.8. Use for login name /[^A-Za-z0-9]/