On Tue, 23 Apr 2019 15:38:53 +0000, Seymour J Metz wrote:

>Metz's law: don't try to validate data unless you really understand and 
>communicate what is permissible.
>
>Take web forms that reject, e.g., valid e-mail addresses, valid ZIP+4.Please!
>
Striking example: "Seymour J Metz <[email protected]>" is a valid e-mail addrss
(RFC 822?), and is fetched by the Copy command in MacOS Mail.app.  Every web 
form
I've tried rejects such, and I must strip it.

But ignore the permissive clause of Postel's principle, please!

-- gil

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