[wp-trac] [WordPress Trac] #37195: Validate usernames only once in a multisite signup

[WordPress Trac]

#37195: Validate usernames only once in a multisite signup
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 Reporter:  arkimedia    |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  General      |    Version:  4.5.3
 Severity:  normal       |   Keywords:
  Focuses:               |
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 In wpmu_validate_user_signup function there is a double validation for
 allowed username.

 First, the username is passed in to a sanitize_user function and after
 that tested with {{{preg_match( '/[^a-z0-9]/', $user_name );}}}

 Latter test is more strict than the one used in sanitize user function and
 doesn't allow for example uppercase characters or dots.

 I think that the latter test is unnecessary. If it can't be removed, we
 should add filter for it.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37195>
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