Replace all occurrences of alphanumeric characters followed by a hyphen and another alphanumeric character with the second alphanumeric character followed by a hyphen and the first alphanumeric character in all files with a name ending in ".conf" in any directory.
sed -i "s/\([[:alnum:]]\)-\([[:alnum:]]\)/\2-\1/g" $(find / -type f -name "*.conf*")