Hi,
You might want to checkout the perl module Regex::Common::Email::Address
Best Regards
Martin
On 2017-01-06 13:16, Petr Hanousek wrote:
Hello Jeffrey,
thank you, I'll try to implement it here. Wonder if someone has done it
before or if there is any plugin for this? Or (the best way) if some
developer encodes it to some future release of RT? :)
Petr
On 5.1.2017 21:51, Jeffrey Pilant wrote:
Check out
http://www.regular-expressions.info/email.html
It indicates the 'most' official regex is:
\A(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*
| "(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]
| \\[\x01-\x09\x0b\x0c\x0e-\x7f])*")
@
(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?
| \[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}
(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:
(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]
| \\[\x01-\x09\x0b\x0c\x0e-\x7f])+)
\])\z
Yeah. Quite a mouthful. This is because there are quite a few ways
to express email addresses. And even this is not foolproof.
The same page also has other simpler regex expressions that work a
fair amount of the time, but are less complicated, like:
\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b
The page claims it is 99% effective.
That, however, does not solve your problem. Just because it is
formulated correctly does not mean it is a valid address.
The usual solution is to whitelist the addresses and do a lookup. Any
address not found gets added tentatively, but flagged for testing.
You can also at this time prompt for acceptance vs. going back to an
edit screen. This does require you maintain a list of valid email
addresses somewhere. The user list is a likely place, but if you are
sending emails to people who are not users, then that fails.
/jeff
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