It always helps if you are specific. Noone enjoys a game
of "How do I do X?", "This is how you do X", "But I don't
really want to do X, I want to do Y".
So, from 1a2b3.4c5d6e, you want 123.456.
But what if you have 1a2b.3c4d.5e6f? What do
you want then?