noctbot/bot/src/commands/rcg.ts

import request from "request-promise-native";
import { Message } from "discord.js";
import { Command, CommandSet } from "src/model/command";

const rcgRe = /<input id="rcg_image".+value="([^"]+)".*\/>/i;

@CommandSet
export class Rcg {
    @Command({
        pattern: "random comic",
        auth: false,
        documentation: {description: "Generates a comic just for you!", example: "random comic"}
    })
    async randomComic(msg: Message) {
        let result = await request("http://explosm.net/rcg/view/?promo=false");
    
        let regexResult = rcgRe.exec(result);

        if(!regexResult)
            return;

        msg.channel.send(`${msg.author.toString()} I find this very funny:`, {
            files: [ regexResult[1].trim() ]
        });
    }
};