[user@host] $ cd $DOKU_DIR/data/pages
[user@host] $ find  | xargs grep -P -oh "\{\{[.]?\:.+?\..{3}(\|.+)?\}\}" \
| sed -e 's/{{\./{{/' -e 's/|[^}]*//g' -e 's/[{{|}}]//g' > /tmp/mediareferences.txt