From 95b272b4e0d5438a12702e51e05d03f5a5a8e505 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Mon, 6 Feb 2017 07:15:31 -0800
Subject: Substitute a more readable f-string

---
 Doc/library/re.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Doc/library/re.rst b/Doc/library/re.rst
index 7ef4cbeee7..fe5ebcc67c 100644
--- a/Doc/library/re.rst
+++ b/Doc/library/re.rst
@@ -1465,7 +1465,7 @@ successive matches::
             elif kind == 'SKIP':
                 pass
             elif kind == 'MISMATCH':
-                raise RuntimeError('%r unexpected on line %d' % (value, line_num))
+                raise RuntimeError(f'{value!r} unexpected on line {line_num}')
             else:
                 if kind == 'ID' and value in keywords:
                     kind = value
-- 
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