1 val my_urls = """urbanc""".r

     2 

     3 def crawl(url: String, n: Int) : Unit = {

     4   if (n == 0) ()

     5   else if (my_urls.findFirstIn(url) == None) ()

     6   else {

     7     println("Visiting: " + n + " " + url)

     8     for (u <- get_all_URLs(get_page(url))) crawl(u, n - 1)

     9   }

    10 }