diff --git a/presubmit_support.py b/presubmit_support.py
index b6327621d..5853e0b3d 100755
--- a/presubmit_support.py
+++ b/presubmit_support.py
@@ -150,15 +150,15 @@ class InputApi(object):
   # perspective. Don't modify this list from a presubmit script!
   DEFAULT_WHITE_LIST = (
       # C++ and friends
-      r".*\.c", r".*\.cc", r".*\.cpp", r".*\.h", r".*\.m", r".*\.mm",
-      r".*\.inl", r".*\.asm", r".*\.hxx", r".*\.hpp",
+      r".*\.c$", r".*\.cc$", r".*\.cpp$", r".*\.h$", r".*\.m$", r".*\.mm$",
+      r".*\.inl$", r".*\.asm$", r".*\.hxx$", r".*\.hpp$",
       # Scripts
-      r".*\.js", r".*\.py", r".*\.sh", r".*\.rb", r".*\.pl", r".*\.pm",
+      r".*\.js$", r".*\.py$", r".*\.sh$", r".*\.rb$", r".*\.pl$", r".*\.pm$",
       # No extension at all, note that ALL CAPS files are black listed in
       # DEFAULT_BLACK_LIST below.
-      r"(^|.*[\\\/])[^.]+$",
+      r"(^|.*?[\\\/])[^.]+$",
       # Other
-      r".*\.java", r".*\.mk", r".*\.am",
+      r".*\.java$", r".*\.mk$", r".*\.am$",
   )
 
   # Path regexp that should be excluded from being considered containing source