Convert vector of lists into vector of vectors

Question

I have the following data in a .txt file:

1|John Smith|123 Here Street|456-4567
2|Sue Jones|43 Rose Court Street|345-7867
3|Fan Yuhong|165 Happy Lane|345-4533
         


        

Answer 1

I would do it slightly differently, so you first break it up into lines, then process each line. It also makes the regex simpler:

(ns tst.demo.core
  (:require
    [clojure.string :as str] ))

(def data
"1|John Smith|123 Here Street|456-4567
2|Sue Jones|43 Rose Court Street|345-7867
3|Fan Yuhong|165 Happy Lane|345-4533")

  (let [lines       (str/split-lines data)
        line-vecs-1 (mapv #(str/split % #"\|" ) lines)
        line-vecs-2 (mapv #(str/split % #"[|]") lines)]
    ...)

with result:

lines => ["1|John Smith|123 Here Street|456-4567" 
          "2|Sue Jones|43 Rose Court Street|345-7867" 
          "3|Fan Yuhong|165 Happy Lane|345-4533"]

line-vecs-1 => 
   [["1" "John Smith" "123 Here Street" "456-4567"]
    ["2" "Sue Jones" "43 Rose Court Street" "345-7867"]
    ["3" "Fan Yuhong" "165 Happy Lane" "345-4533"]]

line-vecs-2 => 
   [["1" "John Smith" "123 Here Street" "456-4567"]
    ["2" "Sue Jones" "43 Rose Court Street" "345-7867"]
    ["3" "Fan Yuhong" "165 Happy Lane" "345-4533"]]

Note that there are 2 ways of doing the regex. line-vecs-1 shows a regex where the pipe character is escaped in the string. Since regex varies on different platform (e.g. on Java one would need "\|"), line-vecs-2 uses a regex class of a single character (the pipe), which sidesteps the need for escaping the pipe.

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Update

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