public Builder addRegionCodesBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      ensureRegionCodesIsMutable();
      regionCodes_.add(value);
      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>

@param value The bytes of the regionCodes to add.
@return This builder for chaining.
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/ThreatDiscovery.java