strawpollbox.user.js

// ==UserScript==
// @name         Strawpoll Onebox
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  Create Strawpoll oneboxes.
// @author       Teh Flamin' Taco
// @include *://chat.meta.stackoverflow.com/rooms/*
// @include *://chat.meta.stackexchange.com/rooms/*
// @include *://chat.stackexchange.com/rooms/*
// @include *://chat.stackoverflow.com/rooms/*
// @include *://chat.askubuntu.com/rooms/*
// @include *://chat.serverfault.com/rooms/*
// @run-at document-end
// @grant        none
// ==/UserScript==

/* global $ */
(function() {
    'use strict';
    setInterval(function() {
        var x = $("div:contains('strawpoll.me')");
        for (var i = 0; i < x.length; i++) {
            var matches = x[i].textContent.match(/^(https?:\/\/)?(www\.)?strawpoll.me\/(\d+)$/gi);
            if (matches) {
                console.log(matches);
                x[i].innerHTML = "<center><iframe src=\"https://www.strawpoll.me/embed_1/" + matches[0].match(/\d+/)[0] + "\" style=\"width:700px;height:320px;border:0;\">Loading poll...</iframe></center>";
            }
        }
    }, 500);
})();