Thomas is absolutely right, Philippe.
Things also get easier if you avoid, or defer side effects, and first focus
on pure functions.
So, for example at the REPL, you might first try processing a literal
sequence of lines, repeatedly adjusting the processing code, tweaking the
regex, until you get it right:
(mapv #(re-find #"\w+\.\w+" %) ["abc def.g" "apple.com ibm.com foo"])
;=> ["apple.com" "ibm.com"]
You could turn the above into a pure function that works on a sequence of
lines:
(defn lines->urls [lines] (mapv #(re-find #"\w+\.\w+" %) lines))
You could then define your file reading code in terms of that pure function:
(defn readf [file]
(with-open [r (clojure.java.io/reader file)]
(lines->urls (line-seq r))))
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