@lukolas The example you provide sees to be REGEX not expression language.  You would need to test some kind of expression language in that Topic Name(s) property.   Another suggestion would be to have a file, or for example generateflowfile, which contains a list of topics.  Then split/extract that list into attributes, then send that attribute to the topic name.     Having a ton of topics going to single processors can become a bottleneck which creates tons of downstream flowfiles from each topic.  So be careful with tuning and concurrency in reference to number and topics and messages per topic.   If this answer resolves your issue or allows you to move forward, please choose to ACCEPT this solution and close this topic. If you have further dialogue on this topic please comment here or feel free to private message me. If you have new questions related to your Use Case please create separate topic and feel free to tag me in your post.     Thanks, Steven @ DFHZ ... View more