On 2022-06-27, at 16:08, Jürgen Schönwälder
<[email protected]> wrote:
>
> Petterns are nice to have to detect wrong values "early" but once
> patterns become very complex, the likelihood increases that they are
> wrong.
We (draft-ietf-core-problem-details) had a grammar mirroring RFC 5646 first but
then came up with (CDDL):
tag38-ltag = text .regexp "[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*"
based on input that the XML documents have been doing the same for a couple of
decades already.
JFYI.
Grüße, Carsten
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