[iOS] validate Url from NSString

- (BOOL) validateUrl: (NSString *) url

{  

     NSString *theURL =@"(http|https)://((\\w)*|([0-9]*)|([-|_])*)+([\\.|/]((\\w)*|([0-9]*)|([-|_])*))+";

     NSPredicate *urlTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", theURL];
    return [urlTest evaluateWithObject:url];
 }