FHIR Chat · property for op=regex

One of the operations that can be used to filter a valueset is regex. However, it's not terribly clear in the spec (that I could see anyhow) what the proper "property" value is to go with the 'regex' op.

Peter Jordan (Aug 29 2019 at 04:29):

The spec states "A property/filter defined by the code system". That would also include the 'Standard Properties' defined here... http://hl7.org/fhir/terminology-service.html#standard-props - of these, one would assume that display or designation are the most likely to be used in conjuction with the regex operator. However, I'm not aware of anyone who has implemented this except, maybe, @Grahame Grieve ?

Lloyd McKenzie (Aug 29 2019 at 05:25):

What I actually want to check is the 'code' - but that's not listed as one of the standard props.

Lloyd McKenzie (Aug 29 2019 at 05:26):

Specific use-case is a filter against ICD-10 where my regex is based on the first character.

Lloyd McKenzie (Aug 29 2019 at 05:26):

(Seeing as how ICD10 codes are defined that way :))

Peter Jordan (Aug 29 2019 at 05:30):

Interesting omission from the standard properties list! However, I note that page is 'only' Maturity Level 4 so it might be possible to add code or identifier to that list. Otherwise, I'm not sure if it would be possible to view a non-surrogate code/identifier as a designation?

Grahame Grieve (Aug 29 2019 at 07:03):

I think it should be code. The properties code, display, and definition are defined for all code systems

Grahame Grieve (Aug 29 2019 at 07:03):

courtesy of the fact that they are all either CodeSystem resources, or have some defined mapping to a CodeSystem resource, even if it doesn't exist in full for size reasons