val http_pattern = """\"https?://[^\"]*\"""".r

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

val email_pattern = 

  """([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})""".r

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

  if (n == 0) ()

  else {

    println(s"Visiting: $n $url")

    val page = get_page(url)

    println(email_pattern.findAllIn(page).mkString("\n"))

    for (u <- get_all_URLs(page)) 

      crawl(u, n - 1)

  }

}