recognize domain characters correctly

lib/philomena/images/image.ex

@@ -140,7 +140,7 @@ defmodule Philomena.Images.Image do
     |> validate_number(:image_height, greater_than: 0, less_than_or_equal_to: 32767)
     |> validate_length(:image_name, max: 255, count: :bytes)
     |> validate_inclusion(:image_mime_type, ~W(image/gif image/jpeg image/png image/svg+xml video/webm))
-    |> unsafe_validate_unique([:image_sha512_hash], Repo)
+    |> unsafe_validate_unique([:image_orig_sha512_hash], Repo)
   end
 
   def source_changeset(image, attrs) do

lib/textile/lexer.ex

@@ -133,6 +133,7 @@ defmodule Textile.Lexer do
       string(","),
       string("_") |> concat(choice([space(), eos()])),
       string("?") |> concat(choice([space(), eos()])),
+      string(";") |> concat(choice([space(), eos()])),
       space(),
       eos()
     ])

lib/textile/url_lexer.ex

@@ -2,11 +2,19 @@ defmodule Textile.UrlLexer do
   import NimbleParsec
 
   def url_ending_in(ending_sequence) do
+    domain_character =
+      choice([
+        ascii_char([?a..?z]),
+        ascii_char([?A..?Z]),
+        ascii_char([?0..?9]),
+        string("-")
+      ])
+
     domain =
       repeat(
         choice([
-          ascii_char([?a..?z]) |> string(".") |> ascii_char([?a..?z]),
-          ascii_char([?a..?z])
+          domain_character |> string(".") |> concat(domain_character),
+          domain_character
         ])
       )