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Opened 10 years ago

Last modified 5 years ago

#27270 new defect (bug)

Validation for leading/trailing periods, or consecutive periods in email addresses is only done on the domain section

Reported by: scruffian's profile scruffian Owned by:
Milestone: Priority: normal
Severity: normal Version: 2.7
Component: Formatting Keywords: has-patch is-email has-unit-tests
Focuses: Cc:


WordPress valids that the domain portion of the email address (after the @) doesn't have leading or trailing periods, or more than one period consecutively, but the same check isn't done on the portion before the @. This means that the following email addresses validate:


The attached patch will resolve this, although it might need a little refactoring to deal with the duplication in trimming periods and whitespace.

Attachments (2)

email_validation.patch (963 bytes) - added by scruffian 10 years ago.
Email validation patch
27270.patch (1.8 KB) - added by jared_smith 10 years ago.
Updated patch and unit test

Download all attachments as: .zip

Change History (12)

10 years ago

Email validation patch

#1 @johnbillion
10 years ago

  • Keywords 2nd-opinion added

Consecutive periods are perfectly valid in the local part of an email address. I'm unsure about leading and trailing periods though.

#2 @johnbillion
10 years ago

  • Keywords needs-unit-tests added

#3 @scruffian
10 years ago

I don't think so. The spec says:

"period (".") may also appear, but may not be used to start or end the local part, nor may two or more consecutive periods appear." (

Last edited 10 years ago by scruffian (previous) (diff)

#4 @johnbillion
10 years ago

Ah, I stand corrected. That's interesting because I have an address that I use in Gmail which contains three consecutive periods.

More email validation fun:

#5 @scruffian
10 years ago

Weird. I wonder if Gmail uses the quoted string syntax to get past these rules? (

Just a theory...

#6 @SergeyBiryukov
10 years ago

  • Component changed from General to Mail

Related: #17491, #17678, #21730, #25108.

#7 @johnbillion
10 years ago

  • Keywords has-patch added; 2nd-opinion removed
  • Version changed from trunk to 2.7

10 years ago

Updated patch and unit test

#8 @jared_smith
10 years ago

  • Keywords needs-unit-tests removed

I've tested the patch, and it works as advertised. I've re-rolled the patch (to make sure it applies cleanly to trunk, and to be a little more verbose in the comments), and updated the unit test as well.

I think this is ready to be committed.

#9 @miqrogroove
9 years ago

  • Component changed from Mail to Formatting
  • Keywords is-email added

#10 @jared_smith
8 years ago

  • Keywords has-unit-tests added

This patch still applies -- can we try to get this in for the 4.5 release?

Also, by way of answering John's question about why it works in Gmail, they have a page that explains that they ignore all periods in the user part of email:

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