echo "letter" | tr '[:upper:]' '[:lower:]' | sed -e "s/\([a-z]\)/:letter-\1:/g"
echo "comic sans" | tr '[:upper:]' '[:lower:]' | sed -e "s/\([a-z]\)/:comicsans-\1:/g"
echo "fancy" | tr '[:upper:]' '[:lower:]' | sed -e "s/\([a-z]\)/:fancy-\1:/g"
echo "regional" | tr '[:upper:]' '[:lower:]' | sed -e "s/\([a-z]\)/:regional_indicator_\1:/g"