diff --git a/app/models/chunks/category.rb b/app/models/chunks/category.rb
index aa1ea7e3..a352851c 100644
--- a/app/models/chunks/category.rb
+++ b/app/models/chunks/category.rb
@@ -8,7 +8,8 @@ require 'chunks/chunk'
 #
 # Category lines can be hidden using ':category: news', for example
 class Category < Chunk::Abstract
-  def self.pattern() return /^(:)?category\s*:(.*)$/i end
+  CATEGORY_PATTERN = /^(:)?category\s*:(.*)$/i
+  def self.pattern() CATEGORY_PATTERN  end
 
   attr_reader :hidden, :list
 
diff --git a/app/models/chunks/include.rb b/app/models/chunks/include.rb
index 65459bbe..add2f4cf 100644
--- a/app/models/chunks/include.rb
+++ b/app/models/chunks/include.rb
@@ -7,7 +7,8 @@ require 'chunks/wiki'
 # of changes to that page.
 # If the included page could not be found, a warning is displayed.
 class Include < WikiChunk::WikiLink
-  def self.pattern() /^\[\[!include(.*)\]\]\s*$/i end
+  INCLUDE_PATTERN = /^\[\[!include(.*)\]\]\s*$/i
+  def self.pattern() INCLUDE_PATTERN end
 
   attr_reader :page_name
 
diff --git a/app/models/chunks/literal.rb b/app/models/chunks/literal.rb
index b4e36da4..4fc1cd30 100644
--- a/app/models/chunks/literal.rb
+++ b/app/models/chunks/literal.rb
@@ -8,12 +8,14 @@ module Literal
   # A literal chunk that protects 'code' and 'pre' tags from wiki rendering.
   class Pre < Chunk::Abstract
     PRE_BLOCKS = "a|pre|code"
-    def self.pattern() Regexp.new('<('+PRE_BLOCKS+')\b[^>]*?>.*?</\1>', Regexp::MULTILINE) end
+    PRE_PATTERN = Regexp.new('<('+PRE_BLOCKS+')\b[^>]*?>.*?</\1>', Regexp::MULTILINE)
+    def self.pattern() PRE_PATTERN end
   end 
 
   # A literal chunk that protects HTML tags from wiki rendering.
   class Tags < Chunk::Abstract
     TAGS = "a|img|em|strong|div|span|table|td|th|ul|ol|li|dl|dt|dd"
-    def self.pattern() Regexp.new('<(?:'+TAGS+')[^>]*?>', Regexp::MULTILINE) end
+    TAGS_PATTERN = Regexp.new('<(?:'+TAGS+')[^>]*?>', Regexp::MULTILINE) 
+    def self.pattern() TAGS_PATTERN  end
   end
 end
diff --git a/app/models/chunks/nowiki.rb b/app/models/chunks/nowiki.rb
index ec135a93..ae1e3181 100644
--- a/app/models/chunks/nowiki.rb
+++ b/app/models/chunks/nowiki.rb
@@ -14,8 +14,8 @@ require 'chunks/chunk'
 # Author: Mark Reid <mark at threewordslong dot com>
 # Created: 8th June 2004
 class NoWiki < Chunk::Abstract
-
-  def self.pattern() Regexp.new('<nowiki>(.*?)</nowiki>') end
+  NOWIKI_PATTERN = Regexp.new('<nowiki>(.*?)</nowiki>')
+  def self.pattern() NOWIKI_PATTERN end
 
   attr_reader :plain_text