#6630: allow customizing flags for compiling string.Template.idpattern.
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index 38c872d..68269b9 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -710,6 +710,14 @@
appropriate). The default value is the regular expression
``[_a-z][_a-z0-9]*``.
+* *flags* -- The regular expression flags that will be applied when compiling
+ the regular expression used for recognizing substitutions. The default value
+ is ``re.IGNORECASE``. Note that ``re.VERBOSE`` will always be added to the
+ flags, so custom *idpattern*\ s must follow conventions for verbose regular
+ expressions.
+
+ .. versionadded:: 3.2
+
Alternatively, you can provide the entire regular expression pattern by
overriding the class attribute *pattern*. If you do this, the value must be a
regular expression object with four named capturing groups. The capturing