[Help on formula]

Hi,

I got four columns of stored list of addresses and dates (two for address
and two for dates) which I want to match against each other. The formats of
those columns are in example below

Column A
10 V Street

Colum B
12/16/2009

Column C
12 DEC:PTDEC 2009

Column D
10 V Street

I want column A and D matched as is and the column Bs first two digits (12)
and last four digits (2009) should be matched with column Cs first two
digits (12) and the last four digits (2009). If they are not the same it
should appear differently (may be red text). Any help on this will greatly
appreciated.