URL Validation

index.js

function isUrl(inputString){
  // Pattern 1 protocol://domain.tld/paths or protocol://subdomain.domain.tld/paths
  // Pattern 2 domain.tld/paths
  
  const allowed_protocols = ["http", "https"];
  
  let input_string = inputString;
  let protocol = "";
  let hostname = "";
  let subdomain = "";
  let domain = "";
  let tld = "";
  let paths = "";
  
  let temp;
  
  for(const _protocol of allowed_protocols) {
    let isProtocol = _protocol == input_string.substring(0, _protocol.length); if(!isProtocol) continue;
    let splitter = "://" == input_string.substring(_protocol.length, _protocol.length+3); if(!splitter) break;
    protocol = _protocol;
  }
  
  if(protocol) input_string = input_string.substring(protocol.length+3);
  
  temp = input_string.split("/");
  hostname = temp.shift();
  paths = temp.join("/");
  
  temp = hostname.split(".");
  
  if(temp.length == 3) return true;
  else if(temp.length == 2) return true;
  else return false;
}