The regexp was matching "slappart10" in `/path/to/slappart10/software.cfg`,
was also matching "slappart10" in `/path/to/aaslappart10aa/software.cfg`
and was not matching "slappart1" in `/path/to/slappart1/software.cfg`
or "slappart1000" in `/path/to/slappart1000/software.cfg`.

The fix allows to match "slappartX" in `/path/to/slappartX/software.cfg`
where X can be between 0 to infinite. Also, it protects from matching
"slappartX" in `/path/to/aaaslappartXaaa/software.cfg`.