Issue with include regular expression

I have the following folder structure that I need to monitor but I’d only like to backup files that match the regular expression db_[0-9]*\.sqlite3.

When I set that expression as a filter for include regular expression it doesn’t match anything.

Any help would be appreciated.

Welcome to the forum @hwwilliams

I think a filter works on the complete path, so if it starts with db_ that could explain a non-match.
Filters covers the topic, and you can see how the left side of an RE commonly begins with a .*
The TEST-FILTERS command can test the include. Note an RE must also be between [ and ].