function convert(text)
{
  var exp = /(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
  var text1=text.replace(exp, "$1");
  var exp2 =/(^|[^\/])(www\.[\S]+(\b|$))/gim;
  return text1.replace(exp2, '$1$2');
}