swift - One SearchBar for loading URL and searching -

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i'm searching how can when searchbar see it's url , go url instead of searching on google. example, when write www.twitter.com in searchbar, webview load twitter instead of searching, search still available same searchbar.

my code : 

func searchbarsearchbuttonclicked(searchbar: uisearchbar!) {          searchbar.resignfirstresponder()         var text = searchbar.text         text = text.stringbyreplacingoccurrencesofstring(" ", withstring: "+");         var url = nsurl(string: "http://google.com/search?q=".stringbyappendingstring(text));         var req = nsurlrequest(url:url!)         self.webview!.loadrequest(req)


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