validation for email regex including empty strings

[yeoldegrove]

I am trying to validate an email address in a Form Field. The email validation regex part and the single space (^ $) parts work fine....
however the empty string part does just not work and keeps complaining after the empty input --> ^$

"Custom validation rules"
"Must match regex"
"Value"
^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,6}$|^$|^ $

Any ideas on how to achieve my goal?

[mjashanks]

Hi Eike. I found this one to work:

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?

[NicolasFabre81]

I'm afraid it is not perfect : for example, zz@zz.com' does validate

[shogunpurple]

Are you sure? It doesn't seem to:

Also tested inside BB and working as expected.

[NicolasFabre81]

Yes, tested again in BB V2.1.42 : I manage to save the row with the wrong email zz@zz.com' whereas the control is enabled :

[NicolasFabre81]

Sorry guys, but in V2.4 the problem remains : quotes ' are not filtered by this regex

[yeoldegrove]

Your email regex is much more sophisticated but only covers the email part.
"empty input" is really my problem here... which should also be valid.

[yeoldegrove]

Appending |^$|^ $ to your regex does also not work for me.

[mjashanks]

Ah-ha. I get you...

If you use "Configure Condition" (bottom right), then you can apply the validation only when the field is set....

[zeigerpuppy]

How about this based on RFC 5322

^((?:[A-Za-z0-9!#$%&'*+\-\/=?^_`{|}~]|(?<=^|\.)"|"(?=$|\.|@)|(?<=".*)[ .](?=.*")|(?<!\.)\.){1,64})(@)((?:[A-Za-z0-9.\-])*(?:[A-Za-z0-9])\.(?:[A-Za-z0-9]){2,})$

https://regex101.com/r/3uvtNl/1