logwatcher | Log Watcher Library

I'm trying to make a custom logwatcher of a log folder using python. The objective is simple, finding a regex in the logs and write a line in a text if find it.

The problem is that the script must be running constantly against a folder in where could be multiple log files of unknown names, not a single one, and it should detect the creation of new log files inside the folder on the fly.

I made some kind of tail -f (copying part of the code) in python which is constantly reading a specific log file and write a line in a txt file if regex is found in it, but I don't know how could I do it with a folder instead a single log file, and how can the script detect the creation of new log files inside the folder to read them on the fly.