[wp-trac] [WordPress Trac] #23430: sanitize_user() disallows + in usernames causes problem for email as username

[WordPress Trac]

#23430: sanitize_user() disallows + in usernames causes problem for email as
username
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 Reporter:  jb510            |       Type:  enhancement
   Status:  new              |   Priority:  normal
Milestone:  Awaiting Review  |  Component:  Users
  Version:  3.5.1            |   Severity:  minor
 Keywords:                   |
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 I want to use email addresses as usernames which seems to work fine,
 except sanitize_user() doesn't allow a + in the username and my email
 addresses have + in them.

 Google/gmail allows one to use a + modifier on emails like so:
 user+admin at gmail.com, user+editor at gmail.com, user+author at gmail.com, etc...

 I often use this to get around WordPress's requirement for unique email
 addresses but it's also intended for and useful in filtering:
 user+blog1 at gmail.com, user+blog2 at gmail.com, etc...

 Is there a reason we can't allow +'s in usernames or could it be moved to
 the strict case only?

 See formatting.php:892

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Ticket URL: <http://core.trac.wordpress.org/ticket/23430>
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