WPF Application Rich Text Box Extract Certain Text Data

Question

I have a rich text box within my WPF app, and would like to extract some data items (which consists of text/numbers in a list) from this. Could someone please help me to do this? I will send my application and data if you provide me with a link to send to. Another issue, is how do I later go about saving this data into text format. The list I need to extract looks like similar to this when loaded. WHOLE LOT OF DATA AT THE TOP I DON'T NEED Section A | Section B | Section C | Section D 000000000 11111111 2222222 1111111 ..hence I would like to extract just the two centre columns, and ignore all the data at the top of the list before the items I require. Thank-you.