In Clojure how can I convert a String to a number?

Question

I have various strings, some like \"45\", some like \"45px\". How how I convert both of these to the number 45?

Answer 1

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

user> (parse-int "10px")
10
user> (parse-int "10")
10