FIX: tokenize words with dots correctly

hello.world is now tokenized as "hello.world" and "world" that way the word
"world" will find the post with "hello.world"

app/models/search_observer.rb

@@ -125,7 +125,14 @@ class SearchObserver < ActiveRecord::Observer
 
     def characters(string)
       scrubbed << " "
-      scrubbed << string
+      scrubbed << string.gsub(/\p{L}*\.\p{L}*/) do |with_dot|
+        split = with_dot.split(".")
+        if split.length > 1
+          with_dot + (" " << split[1..-1].join(" "))
+        else
+          with_dot
+        end
+      end
       scrubbed << " "
     end
   end

spec/components/search_spec.rb

@@ -540,6 +540,11 @@ describe Search do
 
     end
 
+    it 'can tokenize dots' do
+      post = Fabricate(:post, raw: 'Will.2000 Will.Bob.Bill...')
+      expect(Search.execute('bill').posts.map(&:id)).to eq([post.id])
+    end
+
     it 'supports category slug and tags' do
       # main category
       category = Fabricate(:category, name: 'category 24', slug: 'category-24')