diff --git a/elixir/data.py b/elixir/data.py
index b952943..86d1d23 100755
--- a/elixir/data.py
+++ b/elixir/data.py
@@ -25,8 +25,8 @@ import os
 import os.path
 import errno
 
-deflist_regex = re.compile(b'(\d*)(\w)(\d*)(\w),?')
-deflist_macro_regex = re.compile('\dM\d+(\w)')
+deflist_regex = re.compile(rb'(\d*)(\w)(\d*)(\w),?')
+deflist_macro_regex = re.compile(r'\dM\d+(\w)')
 
 ##################################################################################
 
diff --git a/elixir/web.py b/elixir/web.py
index 324a788..1e0588d 100755
--- a/elixir/web.py
+++ b/elixir/web.py
@@ -560,7 +560,7 @@ def generate_source(q: Query, project: str, version: str, path: str) -> str:
     html_code_block = format_code(fname, code)
 
     # Replace line numbers by links to the corresponding line in the current file
-    html_code_block = sub('href="#codeline-(\d+)', 'name="L\\1" id="L\\1" href="#L\\1', html_code_block)
+    html_code_block = sub(r'href="#codeline-(\d+)', 'name="L\\1" id="L\\1" href="#L\\1', html_code_block)
 
     for f in filters:
         html_code_block = f.untransform_formatted_code(filter_ctx, html_code_block)