#11027: documented how to override SECTCRE
diff --git a/Doc/library/configparser.rst b/Doc/library/configparser.rst
index d0d159b..cb6f259 100644
--- a/Doc/library/configparser.rst
+++ b/Doc/library/configparser.rst
@@ -716,6 +716,38 @@
>>> list(custom['Section2'].keys())
['AnotherKey']
+.. attribute:: SECTCRE
+
+ A compiled regular expression used to parse section headers. The default
+ matches ``[section]`` to the name ``"section"``. Whitespace is considered part
+ of the section name, thus ``[ larch ]`` will be read as a section of name
+ ``" larch "``. Override this attribute if that's unsuitable. For example:
+
+ .. doctest::
+
+ >>> config = """
+ ... [Section 1]
+ ... option = value
+ ...
+ ... [ Section 2 ]
+ ... another = val
+ ... """
+ >>> typical = ConfigParser()
+ >>> typical.read_string(config)
+ >>> typical.sections()
+ ['Section 1', ' Section 2 ']
+ >>> custom = ConfigParser()
+ >>> custom.SECTCRE = re.compile(r"\[ *(?P<header>[^]]+?) *\]")
+ >>> custom.read_string(config)
+ >>> custom.sections()
+ ['Section 1', 'Section 2']
+
+ .. note::
+
+ While ConfigParser objects also use an ``OPTCRE`` attribute for recognizing
+ option lines, it's not recommended to override it because that would
+ interfere with constructor options *allow_no_value* and *delimiters*.
+
Legacy API Examples
-------------------