style: convert more string formatting to f-strings

1 files changed, 1 insertions, 1 deletions

diff --git a/coverage/misc.py b/coverage/misc.py
index 584efeaa..fa09f890 100644
--- a/coverage/misc.py
+++ b/coverage/misc.py
@@ -184,7 +184,7 @@ def bool_or_none(b):
 
 def join_regex(regexes):
     """Combine a list of regexes into one that matches any of them."""
-    return "|".join("(?:%s)" % r for r in regexes)
+    return "|".join(f"(?:{r})" for r in regexes)
 
 
 def file_be_gone(path):