CrazyGoogleAppScript.js

  function saveLinks() {
    var LABEL_ID = "Conference";
    var SHEET_ID = "EXAMPLE";
    var message, messageById, body;
    
    var ssNew = SpreadsheetApp.create(SHEET_ID);
    
    var label = GmailApp.getUserLabelByName(LABEL_ID);
    var threads = label.getThreads();

    for (var i = 0; i < threads.length; i++) {
      message = threads[i].getMessages()[0];
      messageById = message.getId();
      
      body = message.getPlainBody();
      links = getURLS(body);

      links.forEach(function(element, index, array) {
        if (linkFilter(element)) {
          Logger.log(element)
        }
          ssNew.appendRow([element]);
      });

    }
    
    Logger.log(ssNew.getUrl());
  }

  function expandURL(shortLink) {
    // Going to be Crazy expensive (time). Maybe queue them up?
    // Also only do this optionally.
    var URL_EXPANDER = 'http://api.longurl.org/v2/expand?url=';

  }

  function linkFilter(link) {
    // ADD TO ARRAY for filter by strings
    var FILTER_ARRAY = [
     'unsubscribe', 'corporate'
    ];
   
    for (var i = 0; i < FILTER_ARRAY.length; i++) {
      if (FILTER_ARRAY[i].indexOf(link) == -1) {
       return true;
      }
    }

    return false;
  }

  function getURLS(text) {
    var URL_MATCH = /(((https?):\/\/)[\-\w@:%_\+.~#?,&\/\/=]+)/g;
    var source = (text || '').toString();
    var urlArray = [];
    var url;
    var matchArray;

    // Iterate through any URLs in the text.
    while( (matchArray = URL_MATCH.exec( source )) !== null ) {
      var token = matchArray[0];
      urlArray.push( token );
    }
    
    return urlArray;
  }