Re: Validating The Form of an Email Address

On 2/27/07, Brian Lewis <brian@xxxxxxxxx> wrote:

On Tue, 27 Feb 2007 15:35:01 -0600
"Bruce Collins" <bruce.collins@xxxxxxxxxxxxx> wrote:

> Has any of youz guyz written some code I can use in an RPGLE program
> to validate the construct of an email address?

Due to the very permissive description of email addresses, it is
extremely difficult to *strictly* validate the form of one.

That said, here is a plausible regular expression we use to validate
email addresses in one of our Java programs:

"^([^@\\s]+)@((?:[-a-z0-9]+\\.)+[a-z]{2,})$"

--
Brian Lewis
http://www.i5sec.com/

Just for the archives, if it helps anyone, here is the Regex pattern we use:

"^((?>[a-zA-Z\d!#$%&'*+\-/=?^_`{|}~]+\x20*|""((?=[\x01-\x7f])[^""\\]|\\[\x01-\x7f])*""\x20*)*(?<angle><))?((?!\.)(?>\.?[a-zA-Z\d!#$%&'*+\-/=?^_`{|}~]+)+|""((?=[\x01-\x7f])[^""\\]|\\[\x01-\x7f])*"")@(((?!-)[a-zA-Z\d\-]+(?<!-)\.)+[a-zA-Z]{2,}|\[(((?(?<!\[)\.)(25[0-5]|2[0-4]\d|[01]?\d?\d)){4}|[a-zA-Z\d\-]*[a-zA-Z\d]:((?=[\x01-\x7f])[^\\\[\]]|\\[\x01-\x7f])+)\])(?(angle)>)$"

It wouldn't be pretty to implement in an RPG program...