[UA-discuss] [UA-EAI] Regular Expression To Validate EAI Addresses

[Abdelmeniem Tharwat]

So now we back to the short regex for EAI address validation at same time it will be good to have more patterns to test and make any necessary changes.

FYI, I used this regex with bootstrap and query for the client side validation and use it inside the Java code for server side validation.

Sent from my iPhone

> On Aug 15, 2020, at 4:55 PM, John Levine <john.levine at standcore.com> wrote:
> 
> In article <14D6CA6C-2F5F-4FAB-8602-41B700DB727E at viagenie.ca>,
> Marc Blanchet <marc.blanchet at viagenie.ca> wrote:
>> The recommendation I made during the Java tutorial on UA is as follows:
>> - use a simple regex to throw out the basic errors (example: an (EAI 
>> email address must have a « @ «  and at least one « . » on the 
>> right side; you can enhance this a bit, but if you go too much, then you 
>> start getting into trouble)
>> - use a library for verifying IDNA.
>> - there is not that much one can do on the left side of an EAI email 
>> address. maybe just verifying it is a valid UTF-8 string.
>> 
>> John Levine also wrote similarly in a previous email in this thread.
> 
> You can do a little more validation of the mailbox to be sure it follows
> the syntax rules, e.g., doesn't have two unquoted dots in a row.  For practical
> purposes I would also exclude % and ! which used to be (ab)used for source
> routing and are likely to fail.
> 
> -- 
> Regards,
> John Levine, johnl at taugh.com, Primary Perpetrator of "The Internet for Dummies",
> Please consider the environment before reading this e-mail. https://jl.ly
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