Personally used for torrents but works for other files too.
Watches a target directory for files which match a regex and hardlinks them to another location using the capture groups from regex.
File named config in the root directory.
Target can contain $n where n is the number of the capture group.
"source directory" "regex" "target"
Example:
"/external/downloads/linux" "archlinux-(\d+)\.(\d+)\.\d+-x86_64\.iso" "/var/www/mirror/arch/$1-$2.iso"
Figure it out yourself- can't be bothered to document. Just needed this for myself.