How do I convert a string into two integers in Clojure?

A json-encoded string is passed into my function, and I need to split that string based on a delimiter, then convert the first two delimited values into integers and assign them to variables which will be used within the functio开发者_JAVA技巧n. I've got code that works, though it looks clumsy to me.

(:use [clojure.string :only (split trim)])
(:use [clojure.data.json :only (json-str write-json read-json)])

(defn parse-int [s] (Integer. (re-find #"[0-9]*" s)))

(map parse-int (take 2
  (map trim (seq (.split #"\|"
    (read-json "\" 123 | 456 | 789 \""))))))

I've hard-coded my sample input value for simplicity and so it's easily reproduced in a REPL.

I expect the result: (123 456) (which, in my code, is assigned to (let [[a b])

As I said, this code works, but I feel I must be missing something that would make it less ugly, more idiomatic.

I think this is clearer:

(:use [clojure.string :only (split trim)])
(:use [clojure.data.json :only (read-json)])

(map #(Integer/valueOf (trim %)) 
     (split (read-json input) #"\|"))

assuming input is your input string.

Integer/valueOf (alternatively Integer/parseInt) seems to be the main thing your missing. No need for regex.