val http_pattern = """"https?://[^"]*"""".r
val email_pattern =
"""([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})""".r
def print_str(s: String) =
if (s == "") () else println(s)
def crawl(url: String, n: Int) : Unit = {
if (n == 0) ()
else {
println(s"Visiting: $n $url")
val page = get_page(url)
print_str(email_pattern.findAllIn(page).mkString("\n"))
for (u <- get_all_URLs(page).par) crawl(u, n - 1)
}
}