I think there can be multiple words on each line, so they have to be split
into words first. Maybe something like:
(ns example
(:use [clojure.contrib.duck-streams :only (read-lines)]))
(let [lines (read-lines "file.txt")
words (mapcat #(.split % "\\s") lines)
ing-words (filter (partial re-matches #".*ing") words)]
(doseq [ing-word ing-words]
(println ing-word)))
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