I aplogized that I didn't described the question properly.
you're right about there is not "Reg_" in the name.
I want to monitor the file within .txt at [monitor:///path/to/files/*.txt], and there are hundred of files with [number_Packet_year_month_day] format, and I want to monitor all of the files excluded the "0_Packet_year_month_day.txt" file.
It doesn't work in your first suggestion
blacklist = \d{1}_Packet_\d{4}-\d{2}-\d{2}\.txt caused it will block the file within 0's name, like 40100, 40110...etc, too.
About the second suggestion, it is not data in the file, however, is the file's name. So the props.conf doesn't help in this case I guessed.
Here is a regex online website, and I put my example on there.
I screenshot the result applied your blacklist regex cmd, but it doesn't work.
Result: https://www.dropbox.com/s/8is9hhmlz7ye0v8/0_reg%20blacklist.png?dl=0
... View more