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("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)
}
}