Issue #6561: '\d' in a regular expression should match only Unicode
character category [Nd], not [No].
diff --git a/Modules/_sre.c b/Modules/_sre.c
index 45b92f3..596fd19 100644
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -168,7 +168,7 @@
#if defined(HAVE_UNICODE)
-#define SRE_UNI_IS_DIGIT(ch) Py_UNICODE_ISDIGIT((Py_UNICODE)(ch))
+#define SRE_UNI_IS_DIGIT(ch) Py_UNICODE_ISDECIMAL((Py_UNICODE)(ch))
#define SRE_UNI_IS_SPACE(ch) Py_UNICODE_ISSPACE((Py_UNICODE)(ch))
#define SRE_UNI_IS_LINEBREAK(ch) Py_UNICODE_ISLINEBREAK((Py_UNICODE)(ch))
#define SRE_UNI_IS_ALNUM(ch) Py_UNICODE_ISALNUM((Py_UNICODE)(ch))