Do not break hashtag at zwnj

lib/linkify/parser.ex

@@ -15,7 +15,7 @@ defmodule Linkify.Parser do
 
   @get_scheme_host ~r{^\W*(?<scheme>https?:\/\/)?(?:[^@\n]+\\w@)?(?<host>[^:#~\/\n?]+)}u
 
-  @match_hashtag ~r/^(?<tag>\#[[:word:]_]*[[:alpha:]_·][[:word:]_·\p{M}]*)/u
+  @match_hashtag ~r/^(?<tag>\#[[:word:]_]*[[:alpha:]_·\x{200c}][[:word:]_·\p{M}\x{200c}]*)/u
 
   @match_skipped_tag ~r/^(?<tag>(a|code|pre)).*>*/
 

test/linkify_test.exs

@@ -555,6 +555,18 @@ defmodule LinkifyTest do
                hashtag_prefix: "https://example.com/tag/"
              ) == expected
     end
+
+    test "ZWNJ does not break up hashtags" do
+      text = "#ساٴين‌س"
+
+      expected = "<a href=\"https://example.com/tag/ساٴين‌س\">#ساٴين‌س</a>"
+
+      assert Linkify.link(text,
+               rel: false,
+               hashtag: true,
+               hashtag_prefix: "https://example.com/tag/"
+             ) == expected
+    end
   end
 
   describe "links" do