[CentOS] E-mail advice sought
alice at domblogger.net
Sun May 1 13:03:12 UTC 2016
On 05/01/2016 05:50 AM, Ned Slider wrote:
> On 01/05/16 13:23, Alice Wonder wrote:
>> On 05/01/2016 05:10 AM, Alice Wonder wrote:
>>> I think this is my autism coming in to play, I think what is very clear
>>> to me I just am not able to adequately communicate because clearly
>>> people are not even remotely grasping what I am trying to convey.
>> Basically whether it is a white list or a black list doesn't matter.
>> One is just the complement set of the other.
>> It's the set I'm after. Or its complement. I don't care. Not whether my
>> code should use set A or its complement.
> See Gordon's previous answer above:
> That is, [A-Za-z0-9._][A-Za-z0-9._-]
> In other words, allowable characters are A-Za-z (upper and lower case),
> 0-9 (numerics), . and _ (period and underscore).
> Hyphens are allowed, but NOT as the first character, so maybe easier to
> just not allow hyphens in your account usernames.
Well that excludes ' and I've seen ' (and even ’) in things like
John.O'neill at example.org - I don't see a need to exclude those (or UTF8
above U+007F that non-western people often use) - which is kind of why I
was hoping for a blacklist, characters that should be excluded.
As fas a - and . that may not be at the beginning of a username (or two+
consecutive .) etc. - of course after checking for characters that are
not allowed, the final address would have to go through a validator.
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