app.clj

(ns app                                                                                                                                                                       
  (:require [clojure.string :refer [replace]]))                                                                                                                               
                                                                                                                                                                              
(def s1 "[[][{]]")                                                                                                                                                            
(def s2 "[[]][][{]}[]")                                                                                                                                                       
(def s3 "[[{}][]]")                                                                                                                                                           
(def s4 "([)]")                                                                                                                                                               
                                                                                                                                                                              
(def pattern #"\[\]|\{\}|\(\)")                                                                                                                                               
                                                                                                                                                                              
(defn is-valid?                                                                                                                                                               
  [s]                                                                                                                                                                         
  (if (re-find pattern s)                                                                                                                                                     
    (-> s (replace pattern "") is-valid?)                                                                                                                                     
    (if (empty? s)                                                                                                                                                            
      [:valid]                                                                                                                                                                
      [:in-valid s])))                                                                                                                                                        
                                                                                                                                                                              
(is-valid? s4)