diff --git a/devine/commands/dl.py b/devine/commands/dl.py
index 9bc53da..7b80f41 100644
--- a/devine/commands/dl.py
+++ b/devine/commands/dl.py
@@ -183,7 +183,7 @@ class dl:
 
         if proxy:
             requested_provider = None
-            if re.match(rf"^[a-z]+:.+$", proxy, re.IGNORECASE):
+            if re.match(r"^[a-z]+:.+$", proxy, re.IGNORECASE):
                 # requesting proxy from a specific proxy provider
                 requested_provider, proxy = proxy.split(":", maxsplit=1)
             if re.match(r"^[a-z]{2}(?:\d+)?$", proxy, re.IGNORECASE):
diff --git a/devine/core/utilities.py b/devine/core/utilities.py
index b17a52f..e4939e1 100644
--- a/devine/core/utilities.py
+++ b/devine/core/utilities.py
@@ -74,7 +74,7 @@ def sanitize_filename(filename: str, spacer: str = ".") -> str:
     filename = filename.\
         replace("/", " & ").\
         replace(";", " & ")  # e.g. multi-episode filenames
-    filename = re.sub(rf"[:; ]", spacer, filename)  # structural chars to (spacer)
+    filename = re.sub(r"[:; ]", spacer, filename)  # structural chars to (spacer)
     filename = re.sub(r"[\\*!?¿,'\"()<>|$#]", "", filename)  # not filename safe chars
     filename = re.sub(rf"[{spacer}]{{2,}}", spacer, filename)  # remove extra neighbouring (spacer)s