Matthew Barnett added the comment:
The way the re handles ranges is to convert the two endpoints to lowercase and
then check whether the lowercase form of the character in the text is in that
range.
For example, [A-Z] is converted to the range [\x41-\x5A], and the lowercase
form of 'Q' ('\x51') is 'q' ('\x7A'), which is in the range.
In your example, [\u0400-\u0527] is converted to the range [\u0450-\u0527], but
the lowercase form of 'А' ('\u0410') is 'а' ('\u0430'), which isn't in the
range.
This is the same as issue #3511, but a worse failure.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17381>
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