public Builder clearRegionCodes() {
      regionCodes_ = com.google.protobuf.LazyStringArrayList.emptyList();
      bitField0_ = (bitField0_ & ~0x00000002);
      ;
      onChanged();
      return this;
    }
<pre>
CLDR region code of the countries/regions the URI poses a threat ordered
from most impact to least impact. Example: "US" for United States.
</pre>

<code>repeated string region_codes = 2;</code>

@return This builder for chaining.
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/ThreatDiscovery.java