How to deal with dot in column name?

I have one column called “”, when I use it in the Flux script, it will give error, only the column name without dot works. Does there any way to make it works with dot?

from(bucket: “kafka_signals/twoWeeks”)
|> range(start: 2020-02-20T00:00:00.000000000Z)
|> filter(fn: ® =>
r._measurement==“selected” and“IBMU_AlgoPkSoc”)
|> limit(n:10)

@keigo840413 Use bracket notation to reference the tag rather than dot notation:

filter(fn: (r) =>
  r._measurement == "selected" and r[""] == "IBMU_AlgoPkSoc")