Matching substrings within a Regex

Hi,

I need some help crafting a regular expression.
Consider the following literal expressions:

     Literal String A:
         AccountNumber="

     Literal String B:
        StreetNumber="

I want to find all instances where String A is followed by
string B
(with any number of miscellaneous characters in between).

The catch is that I want to capture only instances where the
left four
digits of the AccountNumber equals the left four digits of
the
StreetNumber.

Examples:

I want to capture the following strings:

     AccountNumber="11324324" blablablablabla
StreetNumber="11322345"
     AccountNumber="234534" blabla
StreetNumber="2345999554"

I DO NOT want to capture the following string:

     AccountNumber="345635" blabla 
StreetNumber="6789689"

Thanks!
Jonathan


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