YANG gen. binding classes with Optional<XYZ> newXYZIfValidPattern() kind of utility factory method

In https://git.opendaylight.org/gerrit/#/c/53118/ for NETVIRT-514 I found myself writing a small utility with a method like this:

Optional<Uuid> newUuidIfValidPattern(String possibleUuid)

in class UuidUtil; about to be proposed into org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.IetfYangUtil also.

I'm wondering if this is an extreme rare case, or not something one might reasonably often encounter wanting to do - perhaps you would consider generating such a utility factory method returning an Optional for all classes generated for regexp expression in YANG, so that in the case of above org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid would have this directly?

Also see MDSAL-238 for a related more minor suggestion.