diff --git a/app/logical/tag_category.rb b/app/logical/tag_category.rb
index efd094c1f..ea3d40b7c 100644
--- a/app/logical/tag_category.rb
+++ b/app/logical/tag_category.rb
@@ -71,6 +71,10 @@ class TagCategory
     def short_name_regex
       @@short_name_regex ||= short_name_list.join("|")
     end
+
+    def category_ids_regex
+      @@category_ids_regex ||= "[#{category_ids.join("")}]"
+    end
   end
 
   extend Mappings
diff --git a/app/models/tag.rb b/app/models/tag.rb
index e6b3e4b03..aafe59dd2 100644
--- a/app/models/tag.rb
+++ b/app/models/tag.rb
@@ -87,7 +87,14 @@ class Tag < ApplicationRecord
     end
 
     def value_for(string)
-      TagCategory.mapping[string.to_s.downcase] || 0
+      norm_string = string.to_s.downcase
+      if norm_string =~ /#{TagCategory.category_ids_regex}/
+        norm_string.to_i
+      elsif TagCategory.mapping[string.to_s.downcase]
+        TagCategory.mapping[string.to_s.downcase]
+      else
+        0
+      end
     end
   end