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

This will work on 10px or px10

(defn parse-int [s]
   (Integer. (re-find  #"\d+" s )))

it will parse the first continuous digit only so

user=> (parse-int "10not123")
10
user=> (parse-int "abc10def11")
10