> Then, for all rows, read and split the string. The best that i have found to
> do that is using regular expressions.
>
> (define split-row (regexp-match #rx"\\[(.+), (.+), (.+)\\]" (read-line)))
>
> Then you have to manually convert the substrings into values
>
> (define a (string->number (second split-row)))
> (define b (third split-row))
> (define c (string->number (fourth split-row)))
This kind of destructuring & conversion from strings to values can sometimes be
more conveniently handled by converting your source data into something that
looks like Racket S-expressions (in this case, by removing the commas) and then
calling `read` to do the rest, e.g.
#lang racket
(with-input-from-file "data.txt"
(λ _ (for/list ([ln (in-lines)])
(read (open-input-string (string-replace ln "," ""))))))
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