How to use matching group in sed replacement
With one capture group
sed -i 's/^Title\: \(.*\)$/title: "\1"/g' *.mdWith more capture groups
sed -i 's|^Date: \([[:digit:]]\{4\}\)/\([[:digit:]]\{2\}\)/|date: \1-\2-|g' *.md
sed -i 's/^Title\: \(.*\)$/title: "\1"/g' *.mdsed -i 's|^Date: \([[:digit:]]\{4\}\)/\([[:digit:]]\{2\}\)/|date: \1-\2-|g' *.md
