URL Parser for Apps Script

gistfile1.txt

//functions to parse URLs adapted for easy usage in apps script
//past the code below in the tools > script editor of any google sheet 
//call the PARSE_URI() formula directly from a cell


// PARSE_URI 1.2.2
// (c) Steven Levithan <stevenlevithan.com>
// MIT License
//adapted for apps script by @dsottimano

/**
* Returns URL parts 
* @param {"https://developer.mozilla.org/en-US/docs/Web/"} url the url you want to parse
* @param {"host"} part the url part you want to return. "source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor" are acceptable values
* @customfunction
*/
function PARSE_URI(url,part) {  
  try {
    if(url.map) {
      return url.map(function(u) {return PARSE_URI(u,part)})
      
    } else {
      PARSE_URI.options = {
        strictMode: false,
        key: ["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"],
        q:   {
          name:   "queryKey",
          parser: /(?:^|&)([^&=]*)=?([^&]*)/g
        },
        parser: {
          strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
          loose:  /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/
        }
      };
      
      if(!IS_VALID_URL(url)) return "Please enter a valid URL";
      var	o   = PARSE_URI.options,
          m   = o.parser[o.strictMode ? "strict" : "loose"].exec(url),
          uri = {},
          i   = 14;
      
      while (i--) uri[o.key[i]] = m[i] || "";
      
      uri[o.q.name] = {};
      uri[o.key[12]].replace(o.q.parser, function ($0, $1, $2) {
        if ($1) uri[o.q.name][$1] = $2;
      });
      if (!uri[part]) return ("No part defined")
      
      if(part === "host") {
      uri = uri[part].split(".")
      if (uri.length > 2) return uri[uri.length-2]  + "." + uri[uri.length-1]
      return uri.join('.')
      }
     
      if(part) return uri[part]
      return uri
        }
  }catch(e) {
    return e
  }
};

//isValidURl credit: https://stackoverflow.com/a/49849482/2121455

function IS_VALID_URL(str) {
  if (typeof str != 'string' || !str) throw "Please enter a valid string"
  try { 
    if (str.map) {
      return str.map(function(s) {return IS_VALID_UR(s)});
    } else {
      var res = str.match(/(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/g);
      if (res) return true
      return false
    }
  } catch(e) {
    return e
  }
};