browserDetection.js

function detectBrowser(userAgent){
  var chrome  = /.*(Chrome\/).*(Safari\/).*/g;
  var firefox = /.*(Firefox\/).*/g;
  var safari  = /.*(Version\/).*(Safari\/).*/g;
  var opera   = /.*(Chrome\/).*(Safari\/).*(OPR\/).*/g;
  var edge   = /.*(Chrome\/).*(Safari\/).*(Edge\/).*/g;
  var ie      = /.*(Trident\/7).*(rv:).*/g;
  
  if(opera.exec(userAgent))
    return "Opera";
  if(edge.exec(userAgent))
    return "Edge";
  if(chrome.exec(userAgent))
    return "Chrome";
  if(safari.exec(userAgent))
    return "Safari";
  if(firefox.exec(userAgent))
    return "Firefox";
  if(ie.exec(userAgent))
    return "Internet Explorer";

  return "not supported";
}