Issue #3665: \u and \U escapes are now supported in unicode regular expressions.
Patch by Serhiy Storchaka.
diff --git a/Doc/library/re.rst b/Doc/library/re.rst
index d8ead68..07623c9 100644
--- a/Doc/library/re.rst
+++ b/Doc/library/re.rst
@@ -414,17 +414,24 @@
accepted by the regular expression parser::
\a \b \f \n
- \r \t \v \x
- \\
+ \r \t \u \U
+ \v \x \\
(Note that ``\b`` is used to represent word boundaries, and means "backspace"
only inside character classes.)
+``'\u'`` and ``'\U'`` escape sequences are only recognized in Unicode
+patterns. In bytes patterns they are not treated specially.
+
Octal escapes are included in a limited form. If the first digit is a 0, or if
there are three octal digits, it is considered an octal escape. Otherwise, it is
a group reference. As for string literals, octal escapes are always at most
three digits in length.
+.. versionchanged:: 3.3
+ The ``'\u'`` and ``'\U'`` escape sequences have been added.
+
+
.. _contents-of-module-re: