Unable to search a user if username is an email address

[subrataemfluence]

If a user has an email address in his username, that user is not searched in admin user list page.

Steps to reproduce:

• Create a new user and use an email address as the username, e.g. abc@gmail.com
• Make sure no user on the system has an email address which contains abc@ in it
• Search a user with abc@ keyword. No user will be returned.

I think since WordPress does not restrict the character @ in username, the search should include username field even when there is @ in search keyword.

Does this make any sense?