Fix tld validation

lib/auto_linker/parser.ex

@@ -338,13 +338,15 @@ defmodule AutoLinker.Parser do
   end
 
   def is_valid_tld?(true, buffer) do
-    [host] = Regex.run(@match_hostname, buffer, capture: [:host])
-
-    if is_ip?(host) do
-      true
+    with [host] <- Regex.run(@match_hostname, buffer, capture: [:host]) do
+      if is_ip?(host) do
+        true
+      else
+        tld = host |> String.split(".") |> List.last()
+        MapSet.member?(@tlds, tld)
+      end
     else
-      tld = host |> String.split(".") |> List.last()
-      MapSet.member?(@tlds, tld)
+      _ -> false
     end
   end
 

test/parser_test.exs

@@ -110,6 +110,19 @@ defmodule AutoLinker.ParserTest do
       text = "google.com"
       assert parse(text, url: false, phone: true) == text
     end
+
+    test "do not link `:test.test`" do
+      text = ":test.test"
+
+      assert parse(text, %{
+               scheme: true,
+               extra: true,
+               class: false,
+               strip_prefix: false,
+               new_window: false,
+               rel: false
+             }) == text
+    end
   end
 
   def valid_number?([list], number) do