and which data are you looking for and what are you hoping to return, using the sample data you have posted.
the data you are trying to return, is that data line always in the same sort of format, for example
Page 1 Submission Interchange Number: ENC002500001326320130317
we could read the line in and look for "Interchange Number" and extract the bit after the colon
the second example of your data would be easier to process, we read in the line, split into an array and compare array elements