I was able to get this resolved, but it looks like the / characters are required. If I remove them, I get an error from Dgraph:
Error: 2 UNKNOWN: Unexpected error while parsing regex arg: ife
at Object.callErrorFromStatus (node_modules/@grpc/grpc-js/src/call.ts:81:24)
at Object.onReceiveStatus (node_modules/@grpc/grpc-js/src/client.ts:334:36)
at Object.onReceiveStatus (node_modules/@grpc/grpc-js/src/client-interceptors.ts:434:34)
at Object.onReceiveStatus (node_modules/@grpc/grpc-js/src/client-interceptors.ts:397:48)