hi,   would you mind posting the code for the ExecuteScript? Maybe that will provide a clue. The thing with regular expressions can be tricky. I have a similar script, I could compare.   A few more ideas: in the script, can you log the filename you're trying to use the regular expressions on? Maybe that's the problem.   Finally, if you just can't get it to work, you may be able to use the processor "ConvertExcelToCSVProcessor", which is available in NiFi version 1.11.4. (depending on what you need to do in your workflow)       ... View more

hi hiderto, it looks like you have some errors in your script. Is it modified from the one supplied by the original thread author?   Something else that might be an issue: you have your script in an "ExecuteScript" processor. Does the script code give the same error when you put it in a "ExecuteGroovyProcessor" instead? In your current "ExecuteScript" processor, under "Properties", have you chosen "Groovy" as the script engine?   ... View more

This is exactly what I was looking for - works perfectly! ... View more