The goal is to authorize the $ character in identifiers. That enable to use JSONSelect with the Google Data Protocol and its Json output - http://code.google.com/intl/fr/apis/gdata/docs/json.html

Author: touv

src/jsonselect.js

@@ -98,7 +98,7 @@
         // (8) bogus JSON strings missing a trailing quote
         "(\\\")|" +
         // (9) identifiers (unquoted)
-        "\\.((?:[_a-zA-Z]|[^\\0-\\0177]|\\\\[^\\r\\n\\f0-9a-fA-F])(?:[_a-zA-Z0-9\\-]|[^\\u0000-\\u0177]|(?:\\\\[^\\r\\n\\f0-9a-fA-F]))*)" +
+        "\\.((?:[_a-zA-Z]|[^\\0-\\0177]|\\\\[^\\r\\n\\f0-9a-fA-F])(?:[\$_a-zA-Z0-9\\-]|[^\\u0000-\\u0177]|(?:\\\\[^\\r\\n\\f0-9a-fA-F]))*)" +
         ")"
     );