[wp-trac] [WordPress Trac] #55821: `is_email()` does not follow PHP FILTER_VALIDATE_EMAIL rules, when an email has double period (..)

[WordPress Trac]

#55821: `is_email()` does not follow PHP FILTER_VALIDATE_EMAIL rules, when an email
has double period (..)
--------------------------+-----------------------------
 Reporter:  khokansardar  |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Formatting    |    Version:  5.9.3
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 If there has a typo in an email address like there has double period .. in
 an email address ( abc..def at xyz.com ). `is_email()` function return valid
 email when we have use like -

 {{{
 is_email( 'abc..def at xyz.com' )
 }}}

 Where it should not return as valid email address. Which is working with
 PHP `FILTER_VALIDATE_EMAIL` checking. When we are checking the same kind
 of email with below code it return `boolean false`.

 {{{
 filter_var( 'abc..def at xyz.com', FILTER_VALIDATE_EMAIL )
 }}}

 Expected behaviour should be like this. When use `is_email()` function it
 should respect like what PHP does.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55821>
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