filename path rules also need a trailing backslash to complete the path and so return the desired results.
Dr. C, if you go to MC's options, then choose 'library', you should see a list of fields. Click on Artist to select it, then click on the edit button. (Note: this is just for looking, you are not going to change anything here)
See that in the bottom right there is a keywords field? so, when searching or filtering by [artist] you can use ar= instead of [artist]=
press 'cancel' to close the edit dialogue.
Select the [filename (path)] field and click on the edit button. add fnp= to the keywords and click OK to save and close.
now, instead of typing out:
-[filename (path)]=[L:\Jamaican Archive\Various Artists\], you will find that -fnp=[L:\Jamaican Archive\Various Artists\] produces the same result for less typing
I commonly use:
aaa= in place of [album artist (auto)]=
fnp= in place of [filename (path)]=
fnn= in place of [filename (name)]=
mt= in place of [media type]=
ft= in place of [file type]=
di= in place of [date imported]=
lp= in place of [last played]=
np= in place of [number plays]=