sed 1 liner

While working on some stuff tonight, I had to reformat several MAC addresses. I asked in #lopsa for some assistance and ended up with this: (Thanks geek)

*script-fu* | egrep -o '^(....[.]....[.]....) |  
sed -e 's/[.]//g' -e 's,\\(..\\),\1:,g' -e 's/:$//'