Partial Matches on Identifiers

[Teddy Tran]

I have been trying to search for partial matches for identifiers. I am specifically trying to search for ServiceRequests identifiers, but it does not work for other resource types as well. An example of a partial match is that when I search for identifiers with the value "123", i would like to receive back serviceRequests with identifiers "12345" and "123456". 

 I saw that in the FHIR spec that identifiers are tokens, and that tokens have the description that "A token type is a parameter that provides a close to exact match search on a string of characters" (https://www.hl7.org/fhir/search.html#token). However, I have not been able to search for partial matches for identifiers. I have tried using different modifiers available on the UI (matches, text, etc) and none of them support partial matching. 

Could you help provide me with a correct search query to try for partial matches, or let me know if this isn't supported/if it will supported in the future? Thanks!