diff --git a/rest_framework/utils/representation.py b/rest_framework/utils/representation.py
index 92075171..49f829c1 100644
--- a/rest_framework/utils/representation.py
+++ b/rest_framework/utils/representation.py
@@ -40,7 +40,7 @@ def smart_repr(value):
     # <django.core.validators.RegexValidator object at 0x1047af050>
     # Should be presented as
     # <django.core.validators.RegexValidator object>
-    value = re.sub(' at 0x[0-9a-f]{4,32}>', '>', value)
+    value = re.sub(' at 0x[0-9A-Fa-f]{4,32}>', '>', value)
 
     return value