Add ignoring non-period points/dots

lib/outlook/internal_tree/raw_internal_basic.ex

@@ -10,10 +10,14 @@ defmodule Outlook.InternalTree.RawInternalBasic do
   alias Outlook.InternalTree.Html
 
   @splitmarker "@@translationunit@@"
+  @nonperiodmarker "@@nonperiod@@"
 
   def set_split_markers([ %InternalNode{type: :text} = textnode | rest ]) do
     [ %InternalNode{textnode |
-        content: String.replace(textnode.content, ~r|([.?!]["'”]?\s*)|u, "\\1#{@splitmarker}")
+        content: textnode.content
+        |> String.replace(~r/([[:upper:]\d])\.(\d)?/u, "\\1#{@nonperiodmarker}\\2")
+        |> String.replace(~r|([.?!]["'”]?\s*)|u, "\\1#{@splitmarker}")
+        |> String.replace(@nonperiodmarker, ".")
         } | set_split_markers(rest) ]
   end