Joker problem

[#1]

I got at simular problem like Sørens Schou, in my case I have digit on both side of the wanted digit.

it look like this:

0100171350104015 - i want to count the red marked digit.  = ****1713501040**

How do I do it? Not like below or is it something in that direction........

count ({<AAR={$(vPreviousYear)},item1={'0100171350104015'}>}item2)

Best regards  

Jesper