[wp-trac] [WordPress Trac] #17904: Multisite has more restrictions on user login character set

[WordPress Trac]

#17904: Multisite has more restrictions on user login character set
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 Reporter:  duck_                         |       Owner:  jeremyfelt
     Type:  defect (bug)                  |      Status:  assigned
 Priority:  normal                        |   Milestone:  4.6
Component:  Login and Registration        |     Version:  3.0
 Severity:  normal                        |  Resolution:
 Keywords:  needs-unit-tests needs-patch  |     Focuses:  multisite
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Changes (by ericlewis):

 * keywords:  has-patch needs-unit-tests => needs-unit-tests needs-patch


Comment:

 We outlined next steps for this ticket during
 [https://wordpress.slack.com/archives/core-multisite/p1462897727001173
 multisite office hours].

 * Remove the 4 character minimum limit.
 * Leave `illegal_names`, but only apply it to multisite.
 * Sandbox the restriction  that a user login must have one letter to
 multisite, and modify the regex appropriately.

 Let's try writing the unit tests first to meet these conditions for
 `wp_validate_user_login()` ;)

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Ticket URL: <https://core.trac.wordpress.org/ticket/17904#comment:46>
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