optimized checkAppropriateIP

src/Util.js

@@ -87,11 +87,7 @@ module.exports.checkAppropriateIP = function(address) {
   // https://blog.markhatton.co.uk/2011/03/15/regular-expressions-for-ip-addresses-cidr-ranges-and-hostnames/
   // also support subnet/net mask
   let regex = new RegExp(/^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/(3[0-2]|[1-2][0-9]|[0-9]))?$/gi);
-  if (!address.match(regex)) {
+  return address.match(regex) !== null ? true : false;
-    throw new Error(`The IP address is not matched with ${regex.toString()} regular expressions.`);
-  };
-
-  return true;
 };
 
 // soon to be continued