Merge branch 'fix-invalid-escapes' of https://github.com/un-pogaz/calibre

Author: kovidgoyal

src/calibre/utils/formatter_functions.py

@@ -1791,7 +1791,7 @@ class BuiltinListJoin(BuiltinFormatterFunction):
 "Genre: F". The following will do that:
 [CODE]
 program:
-    list_join('#@#', $authors, '&', list_re($#genre, ',', '^(.).*$', 'Genre: \1'),  ',')
+    list_join('#@#', $authors, '&', list_re($#genre, ',', '^(.).*$', 'Genre: \\1'),  ',')
 [/CODE]
 ''')