Problem with OccupyAll

I mysteriously found one of my pdf files appearing in all workspaces.

Eventually, by trial and error, I found that this was due to the file name
including 'panel', (meta-cog-panel.pdf). Exploring a bit shows that it did
not matter where in the name 'panel' ocurred.

For some reason, in the past, I had included 'panel' in OccupyAll. I did
not think that that would be triggered whenever 'panel' is a part of a
filename. But it seems that the relevant procedure in list.c does not
distinguish finding a string on its own and finding a string in part
of a longer string. Shouldn't it take account  of the difference between,
for example,

The problem seems to be that regex_match in file list.c is too general.

I am not a an experienced C programmer and did not try modifying it.

I wonder if the behaviour that tripped me up was intended.

aaron