public com.google.protobuf.ByteString getBucketPrefixRegexBytes() {
        java.lang.Object ref = "";
        if (cloudStorageBucketCase_ == 2) {
          ref = cloudStorageBucket_;
        }
        if (ref instanceof java.lang.String) {
          com.google.protobuf.ByteString b =
              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
          if (cloudStorageBucketCase_ == 2) {
            cloudStorageBucket_ = b;
          }
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
<pre>
A regex pattern for bucket names matching the regex. Regex should
follow the syntax specified in `google/re2` on GitHub.
</pre>

<code>string bucket_prefix_regex = 2;</code>

@return The bytes for bucketPrefixRegex.
java-storageinsights/proto-google-cloud-storageinsights-v1/src/main/java/com/google/cloud/storageinsights/v1/DatasetConfig.java