diff -r 10f02605a46a -r 35104ee14f87 progs/crawler3.scala
--- a/progs/crawler3.scala	Sun Sep 07 08:37:44 2014 +0100
+++ b/progs/crawler3.scala	Sat Sep 13 04:30:25 2014 +0100
@@ -11,31 +11,30 @@
 }
 
 // regexes for URLs, for "my" domain and for email addresses
-val http_pattern = """\"https?://[^\"]*\"""".r
+val http_pattern = """"https?://[^"]*"""".r
 val my_urls = """urbanc""".r
 val email_pattern = """([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})""".r
 
-// The regular expression for emails comes from: 
-//    http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/
-
 def unquote(s: String) = s.drop(1).dropRight(1)
 
 def get_all_URLs(page: String) : Set[String] = {
   http_pattern.findAllIn(page).map(unquote).toSet
 }
 
+def print_str(s: String) = 
+  if (s == "") () else println(s)
+
 def crawl(url: String, n: Int) : Unit = {
   if (n == 0) ()
-  //else if (my_urls.findFirstIn(url) == None) ()
   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)
+    print_str(email_pattern.findAllIn(page).mkString("\n"))
+    for (u <- get_all_URLs(page).par) crawl(u, n - 1)
   }
 }
 
 // staring URL for the crawler
-val startURL = """http://www.inf.kcl.ac.uk/staff/urbanc/"""
+val startURL = """http://www.inf.kcl.ac.uk/staff/urbanc"""
 
 crawl(startURL, 3)