diff --git a/mode/lua.py b/mode/lua.py
index 8972451..93df2e5 100644
--- a/mode/lua.py
+++ b/mode/lua.py
@@ -14,16 +14,18 @@ word = chr1 + chr2 + '*'
 
 class LuaGrammar(Grammar):
     rules = [
-        PatternRule('comment', r'--.*$'),
-        PatternRule('spaces', r' +'),
+        RegionRule('comment', r'--\[(?P<level>=*)\[', Grammar, r'\]%(level)s\]'),
+        #RegionRule('comment', r'--\[\[', Grammar, r'\]\]'),
+        PatternRule('comment', '--.*$'),
+        PatternRule('spaces', ' +'),
         PatternRule('eol', r'\n'),
 
-        RegionRule('lua.string', r"'", StringGrammar1, r"'"),
-        RegionRule('lua.string', r'"', StringGrammar2, r'"'),
+        RegionRule('lua.string', "'", StringGrammar1, "'"),
+        RegionRule('lua.string', '"', StringGrammar2, '"'),
 
-        PatternMatchRule('x', '(function)( +)('+word+')',
+        PatternMatchRule('x', '(function)( +)(' + word + ')',
                          'lua.keyword', 'spaces', 'lua.function'),
-        PatternRule('lua.keyword', '(?:while|until|true|then|return|repeat|or|not|nil|local|in|if|function|for|false|end|elseif|else|done|do|break|and)(?!'+chr2+')'),
+        PatternRule('lua.keyword', '(?:while|until|true|then|return|repeat|or|not|nil|local|in|if|function|for|false|end|elseif|else|done|do|break|and)(?!' + chr2 + ')'),
         PatternRule('lua.internal', '_[A-Z]+'),
         PatternRule('lua.identifier', word),