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

Also using (re-seq) function can extend the return value to a string containing all the numbers existing in the input string in order:

(defn convert-to-int [s] (->> (re-seq #"\d" s) (apply str) (Integer.)))

(convert-to-int "10not123") => 10123

(type *1) => java.lang.Integer