[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 (..)
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 Reporter:  khokansardar  |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Formatting    |     Version:  5.9.3
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by Boniu91):

 == Testing Instructions
 These steps define how to reproduce the issue, and indicate the expected
 behavior.

 === Steps to Reproduce
 1. Add the following code to the footer.php, before closing `</html>`
 https://snippi.com/s/8gji8lp
 2. Visit the page and check the footer
 3. 🐞 Bug occurs, `email address is valid` is displayed

 === Expected Results
 When testing a patch to validate it works as expected:
 - 3rd point should display `email address is not valid.`

 === Additionaly
 We could change the `abc..def at xyz.com` to other not valid emails and see
 the results.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55821#comment:3>
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