[wp-trac] [WordPress Trac] #44616: WordPress core registration email field not EAI / IDN (Internationalised Domain Name) compatible

[WordPress Trac]

#44616: WordPress core registration email field not EAI / IDN (Internationalised
Domain Name) compatible
------------------------------------+------------------------
 Reporter:  belikewata              |       Owner:  (none)
     Type:  defect (bug)            |      Status:  closed
 Priority:  normal                  |   Milestone:
Component:  Login and Registration  |     Version:  4.9.7
 Severity:  major                   |  Resolution:  duplicate
 Keywords:                          |     Focuses:
------------------------------------+------------------------
Changes (by birgire):

 * status:  new => closed
 * resolution:   => duplicate
 * milestone:  Awaiting Review =>


Comment:

 Welcome to WordPress Core Trac @belikewata

 The {{{register_new_user()}}} function, from the register part of {{{wp-
 login.php}}}, calls {{{is_email()}}}, where the validation for the local
 part:

 {{{
 // LOCAL PART
 // Test for invalid characters
 if ( ! preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) {
         /** This filter is documented in wp-includes/formatting.php */
         return apply_filters( 'is_email', false, $email,
 'local_invalid_chars' );
 }

 }}}

 and the domain part:

 {{{
 // Test for invalid characters
 if ( ! preg_match( '/^[a-z0-9-]+$/i', $sub ) ) {
         /** This filter is documented in wp-includes/formatting.php */
         return apply_filters( 'is_email', false, $email,
 'sub_invalid_chars' );
 }

 }}}

 seems to be too restrictive.

 The IDN support for {{{is_email()}}} seems to belong to ticket #24487, so
 I close this one.

 Please join in there with your research, thanks.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/44616#comment:1>
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