Channel usage: Type #channelname to switch channels. Type any message WITHOUT # characters to type in that channel. Type #all to switch back to global chat.

spamfilter.user.js

// ==UserScript==
// @name         Robin channel manager and spam filter
// @namespace    http://gist.github.com/NorbiPeti
// @version      0.1
// @description  Filter spa,
// @author       NorbiPeti, originally from nschubach
// @match        https://www.reddit.com/robin/
// @grant        none
// ==/UserScript==
/* jshint -W097 */
'use strict';

var channelname="";

$(document).on('DOMNodeInserted', function(e) {
        var re = null;
        if(window.channelname)
            re = new RegExp("(?:\s)*"+window.channelname+"+");
    $('.robin-message--message', e.currentTarget).each(function() {
        if (/[\u0080-\uFFFF]|(?:\[Robin Autovoter)/.test($(this).text()) || (window.channelname && !re.test($(this).text()))) {
            $(this).parent().remove();
            console.log("removed stuff");
        }
    });
});

$('#robinSendMessage').submit(function(ev) {
    var re = new RegExp("#.+");
    var input=$('input[name=message]');
    if(re.test(input.val()))
        window.channelname=input.val();
    else if(window.channelname)
        input.val(input.val()+" "+window.channelname);
    if(window.channelname=="#all")
        window.channelname="";
});