Spike,
At the risk of losing everyone else on the list... See inline:
> Hmmm...
>
> According to the definition I'm looking at, local-part consists of:
>
> dot-atom / quoted-string / obs-local-part
Agreed. I took the dot-atom approach
> dot-atom allows:
>
> [CFWS] dot-atom-text [CFWS]
So this basically is whitespace AROUND the text, which means that if you
trim the string, you're okay (that's basically how I took it anyway).
> dot-atom-text allows:
>
> 1*atext *("." 1*atext)
Which says: allow 1 or more atext, then 0 or more occurences of "." and then
1 or more atext.
So basically it's saying you can't start or finish with a "." and everything
must be atext.
> atext allows:
>
> [CFWS] 1*atext [CFWS]
>
> and consists of:
>
> ALPHA / DIGIT / ; Any character except controls.
Atext actually consists of:
atext = ALPHA / DIGIT / ; Any character except controls,
"!" / "#" / ; SP, and specials.
"$" / "%" / ; Used for atoms
"&" / "'" /
"*" / "+" /
"-" / "/" /
"=" / "?" /
"^" / "_" /
"`" / "{" /
"|" / "}" /
"~"
The comments are there to explain what the code says (and for everyone else,
the "/" is basically an OR). So atext is:
[a-zA-Z0-9!#$%'*+-/=?^_`{|]~] (unescaped)
So then the regex becomes:
[a-zA-Z0-9!#$%'*+-/=?^_`{|]~]+([.][a-zA-Z0-9!#$%'*+-/=?^_`{|]~])*
Which when escaped is exactly what is there.
>
> That appears to sugggest that dot-atom allows comments
> containing folding whitespace (CFWS).
>
It does yes.
> quoted-string allows:
>
> [CFWS] DQUOTE *([FWS] qcontent) [FWS] DQUOTE [CFWS]
>
> You can recurse back up through the various definitions of
> each of those if you want, but clealy folding whitespace
> (FWS) is permitted.
Agreed.
CFWS = *([FWS] comment) (([FWS] comment) / FWS)
FWS = ([*WSP CRLF] 1*WSP) / ; Folding white space
obs-FWS
WSP = SP / HTAB ; white space
SP = %x20 ; space char
HTAB = %x09 ; horizontal tab
>From section 2.2.3:
"The general rule is that wherever this standard allows for folding white
space (not
simply WSP characters), a CRLF may be inserted before any WSP"
So therefore FWS is basically whitespace that can have linebreaks in it.
So CFWS is commented whitespace. What's a comment? Here:
quoted-pair = ("\" text) / obs-qp
ctext = NO-WS-CTL / ; Non white space controls
%d33-39 / ; The rest of the US-ASCII
%d42-91 / ; characters not including "("
(40),
%d93-126 ; ")" (41), or "\" (92)
ccontent = ctext / quoted-pair / comment
comment = "(" *([FWS] ccontent) [FWS] ")"
CFWS = *([FWS] comment) (([FWS] comment) / FWS)
qcontent = qtext / quoted-pair
qtext = NO-WS-CTL / ; Non white space controls
%d33 / ; The rest of the US-ASCII
%d35-91 / ; characters not including "\"
%d93-126 ; or the quote character
Remembering what the NO-WSP-CTL, text and obsolete bits are:
NO-WS-CTL = %d1-8 / ; US-ASCII control characters
%d11 / ; that do not include the
%d12 / ; carriage return, line feed,
%d14-31 / ; and white space characters
%d127
text = %d1-9 / ; Characters excluding CR and LF
%d11 /
%d12 /
%d14-127 /
obs-text
obs-qp = "\" (%d0-127)
So basically a "comment" is:
( anything I like in here whatsoever as long as it doesn't have brackets or
backslash and has either a whitespace or tab character after the opening
bracket and before the closing bracket although it can contain another
comment ( like this ) or a quoted pair like this \this )
Although I don't see how you end a quoted-pair, unless it guesses.
So you could have an email like this:
[CFWS] dot-atom-text [CFWS]
Or
[CFWS] 1*atext *("." 1*atext) [CFWS]
So this could be:
( This is an email address )paul( an end &&^%%% to the "$%�$%� email address
as a comment \sdfsdfsdf )@pjnetsolutions.com
Which you'll plainly agree is valid but completely silly!
Taking the local-part quoted-string idea you could have:
[CFWS] DQUOTE *([FWS] qcontent) [FWS] DQUOTE [CFWS]
" "
As a "valid" email or:
" There is nothing to stop this being valid email address "
@pjnetsolutions.com
Which also follows the spec!
It all leads to a confusing and plainly quite silly regex when actually we
know pretty much what we want. Although one day I might actually try and do
this!
Paul
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