Fix bug in format suffix patterns

docs/index.md

@@ -59,7 +59,6 @@ Note that the base URL can be whatever you want, but you must include `rest_fram
 ## Quickstart
 
 
-
 ## Tutorial
 
 The tutorial will walk you through the building blocks that make up REST framework.   It'll take a little while to get through, but it'll give you a comprehensive understanding of how everything fits together, and is highly recommended reading.

rest_framework/urlpatterns.py

@@ -8,7 +8,7 @@ def format_suffix_patterns(urlpatterns, suffix_required=False, suffix_kwarg=None
     include a '.format' suffix.  Retains urlpattern ordering.
     """
     suffix_kwarg = suffix_kwarg or api_settings.FORMAT_SUFFIX_KWARG
-    suffix_pattern = '.(?P<%s>[a-z]+)$' % suffix_kwarg
+    suffix_pattern = '\.(?P<%s>[a-z]+)$' % suffix_kwarg
 
     ret = []
     for urlpattern in urlpatterns: