Searching value of specific length

[Marco-Kun]

Hello everyone,

I have the following question:

In a workbook I have a few rows looking like this:

 LISDFGSD CD                          SDGSDFGSDFPLEIN 33 A 3445 EP ROTT 21555                         210521/MIV 16-3-2010/DJ

 DEBI 213405             IAS        PLEINPLEIN 21 B 30e5 EP ROTT 18112825

There are lots of spaces, not consistent at all. Lets say the first line is A1 and the second A2. What I need is a formula in the cell next to these two lines that give me the following values:
For A1: 210521
For A2: 213405

The formula has to subtract a number which is always 6 digits long, starting with "21". It can be anywhere in the cell.

I hope I'm clear enough explaining this!

Thanks in advance,

Marco

Edit: SOLVED