Added a note to [] that special forms & special chars lose their meaning
and backrefs can't be used inside []
diff --git a/Doc/library/re.rst b/Doc/library/re.rst
index 270e551..05db89d 100644
--- a/Doc/library/re.rst
+++ b/Doc/library/re.rst
@@ -181,6 +181,12 @@
``[^5]`` will match any character except ``'5'``, and ``[^^]`` will match any
character except ``'^'``.
+ Note that inside ``[]`` the special forms and special characters lose
+ their meanings and only the syntaxes described here are valid. For
+ example, ``+``, ``*``, ``(``, ``)``, and so on are treated as
+ literals inside ``[]``, and backreferences cannot be used inside
+ ``[]``.
+
``'|'``
``A|B``, where A and B can be arbitrary REs, creates a regular expression that
will match either A or B. An arbitrary number of REs can be separated by the