diff --git a/test/sanity/code-smell/no-illegal-filenames.py b/test/sanity/code-smell/no-illegal-filenames.py
index 52959d3e17..1a663c5aa7 100755
--- a/test/sanity/code-smell/no-illegal-filenames.py
+++ b/test/sanity/code-smell/no-illegal-filenames.py
@@ -53,8 +53,8 @@ ILLEGAL_END_CHARS = [
 ]
 
 
-def check_path(path, dir=False):
-    type_name = 'directory' if dir else 'file'
+def check_path(path, is_dir=False):
+    type_name = 'directory' if is_dir else 'file'
     parent, file_name = os.path.split(path)
     name, ext = os.path.splitext(file_name)
 
@@ -85,10 +85,10 @@ def main():
             continue
 
         for dir_name in dirs:
-            check_path(os.path.join(root, dir_name), dir=True)
+            check_path(os.path.join(root, dir_name), is_dir=True)
 
         for file_name in files:
-            check_path(os.path.join(root, file_name), dir=False)
+            check_path(os.path.join(root, file_name), is_dir=False)
 
 
 if __name__ == '__main__':
diff --git a/test/sanity/code-smell/no-tests-as-filters.py b/test/sanity/code-smell/no-tests-as-filters.py
index 18581bdc20..792dc98834 100755
--- a/test/sanity/code-smell/no-tests-as-filters.py
+++ b/test/sanity/code-smell/no-tests-as-filters.py
@@ -45,7 +45,7 @@ TEST_MAP = {
 }
 
 
-FILTER_RE = re.compile(r'((.+?)\s*(?P<left>[\w \.\'"]+)(\s*)\|(\s*)(?P<filter>\w+))')
+FILTER_RE = re.compile(r'((.+?)\s*(?P<left>[\w .\'"]+)(\s*)\|(\s*)(?P<filter>\w+))')
 
 
 def main():
diff --git a/test/sanity/code-smell/no-underscore-variable.py b/test/sanity/code-smell/no-underscore-variable.py
index 3ec540fe63..bba6173f7e 100755
--- a/test/sanity/code-smell/no-underscore-variable.py
+++ b/test/sanity/code-smell/no-underscore-variable.py
@@ -129,7 +129,7 @@ def main():
 
         with open(path, 'r') as path_fd:
             for line, text in enumerate(path_fd.readlines()):
-                match = re.search(r'(?: |[^C]\()(_)(?: |,|\))', text)
+                match = re.search(r'(?: |[^C]\()(_)(?:[ ,)])', text)
 
                 if match:
                     print('%s:%d:%d: use `dummy` instead of `_` for a variable name' % (