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  3. October 2014

Re: Syntax check a string as a valid email address

On Wed, Oct 15, 2014 at 4:20 PM, Ken Sims <mdrg8066@xxxxxxxxxxx> wrote:
On Wed, 15 Oct 2014 13:18:00 -0400, John Yeung
<gallium.arsenide@xxxxxxxxx> wrote:

No, %SUBST is fine with zero length, and it says so right in the manual.

Actually I had in mind the %SUBSTs where the starting position is
spos+1.

Well, I was responding to Rob, who said he thought %SUBST would fail
on zero length. There's no problem if '@' is the first character.

You're right that the code fails for '@' in the rightmost character,
though with certain additional conditions. It has to be the only '@'
in the whole field, and it has to be the very last possible character
in the field (so in a 50-char field, it would have to be in position
50, and all other 49 characters would have to be something else). In
this case, it would never make it to %SUBST because it would have
already failed on %SCAN (which is probably what you meant, because
that's what has the spos+1 starting position).

John Y.

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