Well, one trick, depending on what the rest of the data looks like, is to search for ",P," in the string.  But, that may give false positives.

A more certain method might look like:

Local NumberVar StrLoc := 1;
Local NumberVar i;

For i := 1 to 8 Do
(StrLoc := InStr(StrLoc,",",{raw_data}) +1);

If {raw_data}[StrLoc] = "P" Then
True
Else
False;

As a note, that is completely untried.  You may need to futz with a +1 here or there to get it to land on the right character.

Another solution is to use the Split function:

array = Split ({table.raw_data}, ",")

This will create an array of substrings so you can easily reference the 8th item without manually counting the commas.

My earlier suggestion of importing the data into an Access database and using the comma as a field delimiter will be more efficient - especially if you are dealing with a lot of records - since Access will have done all the work, Crystal will have an easier job of retrieving the data.