ChukwuEmekaAjah

function vhostof(req, regexp) {
  var host = req.headers.host
  var hostname = hostnameof(req)

  if (!hostname) {
    return
  }

  var match = regexp.exec(hostname)

ChukwuEmekaAjah

function isregexp(val) {
  return Object.prototype.toString.call(val) === '[object RegExp]'
}

ChukwuEmekaAjah

var asteriskRegExp = /\*/g
var asteriskReplace = '([^\.]+)'
var endAnchoredRegExp = /(?:^|[^\\])(?:\\\\)*\$$/
var escapeRegExp = /([.+?^=!:${}()|\[\]\/\\])/g
var escapeReplace = '\\$1'

ChukwuEmekaAjah

const express = require('express');
const app = express();
const vhost = require('vhost');

// after registering all middleware, then you register your hostname as
app.use(vhost('admin.localhost',app));