Need some help from a split() guru:

The following code segment...
print "$_\n" foreach (split(/\./, "Pugh.Pugh.Barney.McGrew.Cuthbert.Dibble.Grub")); ... produces the following list: 
Pugh
Pugh
Barney
McGrew
Cuthbert
Dibble
Grub

[download]
I would like to alter the syntax of my string to group certain words together whilst keeping the embedded '.' character. i.e. Using quote characters to group the first two words: "'Pugh.Pugh'.Barney.McGrew.Cuthbert.Dibble.Grub", such that the list produced would be: 
Pugh.Pugh
Barney
McGrew
Cuthbert
Dibble
Grub

[download]

I can't think how to construct the split regex to achieve this?
Any ideas?

In reply to splitting headache by Wibble

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