FIX: Embedded topic was not found when URL contained query string

app/models/topic_embed.rb

@@ -183,7 +183,7 @@ class TopicEmbed < ActiveRecord::Base
 
   def self.topic_id_for_embed(embed_url)
     embed_url = normalize_url(embed_url).sub(/^https?\:\/\//, '')
-    TopicEmbed.where("embed_url ~* '^https?://#{embed_url}$'").pluck(:topic_id).first
+    TopicEmbed.where("embed_url ~* '^https?://#{Regexp.escape(embed_url)}$'").pluck(:topic_id).first
   end
 
   def self.first_paragraph_from(html)

spec/models/topic_embed_spec.rb

@@ -72,6 +72,11 @@ describe TopicEmbed do
       expect(TopicEmbed.topic_id_for_embed('http://example.com/post/24')).to eq(nil)
       expect(TopicEmbed.topic_id_for_embed('http://example.com/post')).to eq(nil)
     end
+
+    it "finds the topic id when the embed_url contains a query string" do
+      topic_embed = Fabricate(:topic_embed, embed_url: "http://example.com/post/248?key=foo")
+      expect(TopicEmbed.topic_id_for_embed('http://example.com/post/248?key=foo')).to eq(topic_embed.topic_id)
+    end
   end
 
   describe '.find_remote' do