Simplify, make it actually work.

- regexp was too complicated, didn't work

common/djangoapps/static_replace/__init__.py

@@ -16,18 +16,14 @@ def _url_replace_regex(prefix):
     """
     Match static urls in quotes that don't end in '?raw'.
 
-    I'm sorry.  http://xkcd.com/1171/
-
-    (?<!blah) means "don't match if the previous thing is blah".  Clear, eh?
-       (grep for negative lookbehind assertion in
-       http://docs.python.org/2/library/re.html)
+    To anyone contemplating making this more complicated:
+    http://xkcd.com/1171/
     """
     return r"""
         (?x)                      # flags=re.VERBOSE
         (?P<quote>\\?['"])        # the opening quotes
         (?P<prefix>{prefix})      # the prefix
-        (?P<rest>.*?              # everything else in the url...
-               (?<!\?raw))        # ...but not if it has '?raw' at the end.
+        (?P<rest>.*?)             # everything else in the url
         (?P=quote)                # the first matching closing quote
         """.format(prefix=prefix)
 
@@ -84,6 +80,10 @@ def replace_static_urls(text, data_directory, course_namespace=None):
         quote = match.group('quote')
         rest = match.group('rest')
 
+        # Don't mess with things that end in '?raw'
+        if rest.endswith('?raw'):
+            return original
+
         # course_namespace is not None, then use studio style urls
         if course_namespace is not None and not isinstance(modulestore(), XMLModuleStore):
             url = StaticContent.convert_legacy_static_url(rest, course_namespace)