foo.diff

diff --git a/tests/regexplexer.js b/tests/regexplexer.js
index 6128c47..79c38ea 100644
--- a/tests/regexplexer.js
+++ b/tests/regexplexer.js
@@ -1019,3 +1019,20 @@ exports["test yytext state after unput"] = function() {
     assert.equal(lexer.lex(), "NUMBER");
     assert.equal(lexer.lex(), "EOF");
 };
+
+exports["test CSS string"] = function() {
+    var dict = {
+        options: {
+            flex: true,
+            "case-insensitive": true
+        },
+        macros: {
+            string: '"([^\n\r\f\u0022]|\\\n|\\\r\n|\\\r|\\\f|\\[0-9a-f]{1,6}(\r\n|[ \t\r\n\f])?|\\[^\r\n\f0-9a-f])*"'
+        },
+        rules: [
+            ["{string}", "return 'STRING'"]
+        ]
+    };
+
+    var lexer = new RegExpLexer(dict, null, {});
+};