Finding Info In Textareas?

I am trying to read something like the following in a textarea

Code:
|Note|Dur:4th|Pos:n1
|Note|Dur:4th|Pos:n-3
|Note|Dur:4th|Pos:n0
|Note|Dur:4th|Pos:#2
|Note|Dur:4th|Pos:n3
|Note|Dur:4th|Pos:n-2
|Note|Dur:4th|Pos:#-2

There are other types of records but I am only interested in the ones which start with "|Note|". The field after "Pos:" will be compared to members of:

Code:
var offsets = [ "n-6", "#-6", "n-5", "#-5", "n-4", "n-3", ... ]

If there are other fields after Pos:, there will be a "|" or "!" instead of the end of the line.

I was able to run the split(" ") command against the textarea to break it into separate lines, but I couldn't search those lines.