config-parse.clj

(require '[clojure.string :as str])

(defn parse-line [line]
  (let [line (str/replace line #"[\\]\s*(\n\s*|$)" "")]
    (when-not (str/blank? line)
      (let [[k v] (str/split line #"=" 2)]
        [(str/trim k) (when-not (str/blank? v) (str/trim v))]))))

(defn parse [text]
  (let [lines (str/split text #"(?<![\s\\])\s*\n")]
    (into {} (map parse-line lines))))

(def conf "key1=val1
key2 = val2
key3=\\
val3
  key4=\\  
  \\  
  val \\
  4  


emp1
emp2=

e\\
mp3")

(clojure.test/are [k v] (= (get (parse conf) k) v)
  "key1" "val1"
  "key2" "val2"
  "key3" "val3"
  "key4" "val 4"
  "emp1" nil
  "emp2" nil
  "emp3" nil)