OT - fun with sed

[Chris Mohler]

Blech - I completely missed the fact that sed wants '*' and not '+' to
match multiple instances.  D'oh!

This seems to get everything but the last line:
sed -e ':a;N;$!ba;s/\([0-9][0-9][0-9][0-9][0-9]\n\)*\([[0-9][0-9][0-9][0-9][0-9]\n\)/\2/g'

Chris