pathPattern to match file extension does not work if a period exists elsewhere in the file name?

Question

I see numerous examples of using pathPattern to define an intent-filter for a specific file extension/type; for example, pathPattern=".*\\.xyz".

Unfortunately, this does not appear to work properly if the file in question has a period elsewhere in the path; for example "my.filename.xyz".

Is there a pathPattern syntax that will match both "myfilename.xyz" and "my.filename.xyz"?