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You're welcome. This sed command makes use of "group capturing" and does following:

Short version: It matches a pattern of 18 numbers (from the beginning of the line, this is represented by the...

All right, I thought it were literal num's ;) Try this: sed 's/^\([0-9]\{18\}\) \([0-9]\)\./\1 0\2\./'

What/How does not work *exactly*?

Try
sed 's/^num \([0-9]\)\./num 0\1\./'