[had to fish this one out of spam]
On Thu, Nov 03, 2022 at 06:12:02PM -0400, Liam R. E. Quin scripsit:
> On Thu, 2022-11-03 at 15:00 -0400, Graydon Saunders wrote:
> > You can (I think) test if some attribute value is an RFC 4122 UUID by using
> > a regular expression:
> >
> > let $regexp as xs:string :=
> > '^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-5][0-9a-fA-F]{3}-[089abAB][0-9a-
> > fA-F]{3}-[0-9a-fA-F]{12}$'
[snip more structured approach to writing the regular expression]
> Mike Kay gives a solution [1],
>
> translate($in, '0123456789abcdefABCDEF', '000000000000000000000000') =
> '00000000-0000-0000-0000-000000000000'
>
> which is probably enough in practice.
Elegant! thank you! That's probably the least expensive one yet.
> If you need to check further, see RFC 4122 for the components.
> Your regexp limits the UUID value space
> https://datatracker.ietf.org/doc/html/rfc4122#page-5
>
> [1] https://p2p.wrox.com/xslt/68464-validate-guid-uuid.html
Noted, thank you!
(I am thankfully at the proof-of-concept stage.)
--
Graydon Saunders | graydon...@gmail.com
Þæs oferéode, ðisses swá mæg.
-- Deor ("That passed, so may this.")
