Looks like BigQuery uses the RE2 expression library, which doesn't implement lookaheads. From some Googling, it seems the workaround is to use the NOT operator with the REGEXP_CONTAINS function in the query itself... which is obviously not implemented in the Harness platform.

Any chance the team would be willing to add a NOT LIKE operator that would implement NOT REGEXP_CONTAINS in the underlying query it constructs? Think other customers should find this helpful as well.