# coding=utf-8

import re

c = u'İ'

assert len(c) == 1

# This fails on Python 2.7.13, which loses the required combining character.
assert c.lower() != 'i'
assert len(c.lower()) == 2

pattern = re.compile(c, re.IGNORECASE)

assert pattern.match(c)
assert u'i' != c.lower()
assert u'I' != c

# This fails on Python 3.6.1 - despite c.lower() correctly being a two
# codepoint string, the combining character seems to be lost in the match.
assert not pattern.match('i')