diff -r 75c469893514 -r dcd4688690ce progs/app2.scala
--- a/progs/app2.scala	Sun Sep 21 17:40:04 2014 +0100
+++ b/progs/app2.scala	Sun Sep 21 23:23:43 2014 +0100
@@ -1,17 +1,16 @@
-val http_pattern = """\"https?://[^\"]*\"""".r
+val http_pattern = """"https?://[^"]*"""".r
 
 def unquote(s: String) = s.drop(1).dropRight(1)
 
-def get_all_URLs(page: String) : Set[String] = {
+def get_all_URLs(page: String) : Set[String] = 
   http_pattern.findAllIn(page).map(unquote).toSet
-}
 
 def crawl(url: String, n: Int) : Unit = {
   if (n == 0) ()
   else {
     println(s"Visiting: $n $url")
-    for (u <- get_all_URLs(get_page(url))) 
-      crawl(u, n - 1)
+    for (u <- get_all_URLs(get_page(url))) crawl(u, n - 1)
   }
 }
 
+crawl(some_start_URL, 2)