diff --git a/spacy/lang/tokenizer_exceptions.py b/spacy/lang/tokenizer_exceptions.py
index 13140a230..c903448b0 100644
--- a/spacy/lang/tokenizer_exceptions.py
+++ b/spacy/lang/tokenizer_exceptions.py
@@ -37,13 +37,13 @@ URL_PATTERN = (
     r"|"
     # host & domain names
     # mods: match is case-sensitive, so include [A-Z]
-      "(?:"  # noqa
-        "(?:"
-          "[A-Za-z0-9\u00a1-\uffff]"
-          "[A-Za-z0-9\u00a1-\uffff_-]{0,62}"
-        ")?"
-        "[A-Za-z0-9\u00a1-\uffff]\."
-      ")+"
+      r"(?:"  # noqa
+        r"(?:"
+          r"[A-Za-z0-9\u00a1-\uffff]"
+          r"[A-Za-z0-9\u00a1-\uffff_-]{0,62}"
+        r")?"
+        r"[A-Za-z0-9\u00a1-\uffff]\."
+      r")+"
     # TLD identifier
     # mods: use ALPHA_LOWER instead of a wider range so that this doesn't match
     # strings like "lower.Upper", which can be split on "." by infixes in some