Find words in patter of ${keyword}. So in "This is a small ${world}" the function will find and replace ${word} with "foundone"

gistfile1.txt

def lookup(base: String, found: Map[String, String]): String = {
  var resolved = base
  val pattern = Pattern.compile("(\\$\\{([^{}]*)\\})")
  val matcher = pattern.matcher(base)
  while (matcher.find()) {
    val a = matcher.group(2)
    if (!found.containsKey(a)) {
      val b = lookup("foundone", found)
      found.put(a, b)
      print("Found " + b)
      resolved = resolved.replaceFirst("(\\$\\{([^\\${}]*)\\})", b)
    } else {
      val b = found.get(a);
      print("Found " + b)
      resolved = resolved.replaceFirst("(\\$\\{([^\\${}]*)\\})", b)
    }
  }
  resolved
}