Check.js

    //getMail function retrieves the mail body and parses it for useful content.
    //In our case it will parse for all the links in the mail.
    getMail(msgId){
        
        //This api call will fetch the mailbody.
        this.gmail.users.messages.get({
            'userId': this.me,
            'id': msgId
        }, (err, res) => {
            if(!err){
                var body = res.data.payload.parts[0].body.data;
                var htmlBody = base64.decode(body.replace(/-/g, '+').replace(/_/g, '/'));
                var mailparser = new Mailparser();

                mailparser.on("end", (err,res) => {
                    console.log(res);
                })

                mailparser.on('data', (dat) => {
                    if(dat.type === 'text'){
                        const $ = cheerio.load(dat.textAsHtml);
                        var links = [];
                        var modLinks = [];
                        $('a').each(function(i) {
                            links[i] = $(this).attr('href');
                        });

                        //Regular Expression to filter out an array of urls.
                        var pat = /------[0-9]-[0-9][0-9]/;
                        
                        //A new array modLinks is created which stores the urls.
                        modLinks = links.filter(li => {
                            if(li.match(pat) !== null){
                                return true;
                            }
                            else{
                                return false;
                            }
                        });
                        console.log(modLinks);

                        //This function is called to open all links in the array.
                        this.openAllLinks(modLinks);
                    }
                })

                mailparser.write(htmlBody);
                mailparser.end();
                
            }
        });
    }

    openAllLinks(arr){
        arr.forEach(e => {
            open(e); 
        });
    }