diff --git a/tools/build/build.py b/tools/build/build.py
index 33cf02b8..01cd67ec 100755
--- a/tools/build/build.py
+++ b/tools/build/build.py
@@ -172,7 +172,7 @@ def build_oxjs(downloads=False, geo=False):
             ['Geo', 'Image', 'Unicode']
         )),
         'examples': filter(
-            lambda x: not re.search('^[\._]', x),
+            lambda x: not re.search('^[._]', x),
             os.listdir(root_path + 'examples/')
         ),
         'readme': map(
@@ -185,7 +185,7 @@ def build_oxjs(downloads=False, geo=False):
                 'title': get_title(root_path + 'readme/html/' + x)
             },
             filter(
-                lambda x: not re.search('^[\._]', x),
+                lambda x: not re.search('^[._]', x),
                 os.listdir(root_path + 'readme/html/')
             )
         )