question NiFi FetchFile processor - Process specific filenames from ListFile (aka File to fetch Property) in Support Questions

question NiFi FetchFile processor - Process specific filenames from ListFile (aka File to fetch Property) in Support Questions https://community.cloudera.com/t5/Support-Questions/NiFi-FetchFile-processor-Process-specific-filenames-from/m-p/286189#M212274 Hi all. Just playing around with NiFi to evaluate it. I'm trying to read files from the same directory and route them to the appropriate section using a FetchFile processor. Everything is fine when I change ${filename} attribute with the exact file name but I can't filter files evaluating their name. I can't figure out how to fetch only files starting with two characters (eg. 10,11,12,13) Any attempt bring me to an error or to an output filename named true   My NiFi Flow:   ListFile -> FetchFile -> PutHDFS   Thanks Mon, 23 Dec 2019 16:23:25 GMT svasi 2019-12-23T16:23:25Z