Today I came up with this:
(defn locate-lines [regexp]
(let [pattern (. java.util.regex.Pattern
(compile regexp
(. java.util.regex.Pattern
CASE_INSENSITIVE)))]
(debug (str "pattern: " pattern))
(with-open r (new java.io.LineNumberReader
(new java.io.FileReader
"some_large_file.txt"))
(binding [*in* r]
(loop [line (read-line) acc nil]
(if line
(if (. (. pattern (matcher line)) (find))
(recur (read-line)
(if acc
(cons (list (. r (getLineNumber)) line) acc)
(list (list (. r (getLineNumber)) line))))
(recur (read-line) acc))
(reverse acc)))))))
It works well and on my PC it takes a few seconds to search through a
file 140000 lines big and return matches. Can I do something to make
it faster? I actually don't need the line numbers although I thought I
would.
Thanks!
/Mathias
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