diff options
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/library/string.rst | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/Doc/library/string.rst b/Doc/library/string.rst index 1a9b630..1076cdb 100644 --- a/Doc/library/string.rst +++ b/Doc/library/string.rst @@ -755,8 +755,17 @@ attributes: * *idpattern* -- This is the regular expression describing the pattern for non-braced placeholders. The default value is the regular expression - ``[_a-z][_a-z0-9]*``. If this is given and *braceidpattern* is ``None`` - this pattern will also apply to braced placeholders. + ``(?-i:[_a-zA-Z][_a-zA-Z0-9]*)``. If this is given and *braceidpattern* is + ``None`` this pattern will also apply to braced placeholders. + + .. note:: + + Since default *flags* is ``re.IGNORECASE``, pattern ``[a-z]`` can match + with some non-ASCII characters. That's why we use local ``-i`` flag here. + + While *flags* is kept to ``re.IGNORECASE`` for backward compatibility, + you can override it to ``0`` or ``re.IGNORECASE | re.ASCII`` when + subclassing. It's simple way to avoid unexpected match like above example. .. versionchanged:: 3.7 *braceidpattern* can be used to define separate patterns used inside and |