Non-sequential Read/Writes

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Thanks Perturbatio!

Question: You did SeekStream by pointing to the 10th Character place in the file. Can this be done by checking for breaks like commas, tabs, or carriage returns? My final program will need to open a text file which will resemble something like a spreadsheet, and jump down to a specific ROW in order to read several fields. For example, how could I open a file and jump down to Row 3, and read the three fields...or change one of the fields in row 3, from "Red" to "White" for example.

1, Honda, Civic, Blue
2, Ford, Mustang, Black
3, Porsche, 911, Red
4, Pontiac, GrandPrix, Blue