Page Rule URL Match Question

Let’s say my domain has a directory named maindir and that maindir contains a subdirectory named subdir. Both directories contain files of file type webm, which CF does not cache by default. I want to create a page rule to cache all webm files in both directories. Can I do this with a single page rule using the following URL match?*.webm

Or, would that URL only match webm files in maindir, and not the ones in subdir?

It wold match both unless there was a higher priority rule which applied to subdir.