Method test_re_split

Lib/test/test_re.py:404–455

(self)

            re.subn('a', 'b', 'aaaaa', 1, 0, 0)

    def test_re_split(self):
        for string in ":a:b::c", S(":a:b::c"):
            self.assertTypedEqual(re.split(":", string),
                                  ['', 'a', 'b', '', 'c'])
            self.assertTypedEqual(re.split(":+", string),
                                  ['', 'a', 'b', 'c'])
            self.assertTypedEqual(re.split("(:+)", string),
                                  ['', ':', 'a', ':', 'b', '::', 'c'])
        for string in (b":a:b::c", B(b":a:b::c"), bytearray(b":a:b::c"),
                       memoryview(b":a:b::c")):
            self.assertTypedEqual(re.split(b":", string),
                                  [b'', b'a', b'b', b'', b'c'])
            self.assertTypedEqual(re.split(b":+", string),
                                  [b'', b'a', b'b', b'c'])
            self.assertTypedEqual(re.split(b"(:+)", string),
                                  [b'', b':', b'a', b':', b'b', b'::', b'c'])
        for a, b, c in ("\xe0\xdf\xe7", "\u0430\u0431\u0432",
                        "\U0001d49c\U0001d49e\U0001d4b5"):
            string = ":%s:%s::%s" % (a, b, c)
            self.assertEqual(re.split(":", string), ['', a, b, '', c])
            self.assertEqual(re.split(":+", string), ['', a, b, c])
            self.assertEqual(re.split("(:+)", string),
                             ['', ':', a, ':', b, '::', c])

        self.assertEqual(re.split("(?::+)", ":a:b::c"), ['', 'a', 'b', 'c'])
        self.assertEqual(re.split("(:)+", ":a:b::c"),
                         ['', ':', 'a', ':', 'b', ':', 'c'])
        self.assertEqual(re.split("([b:]+)", ":a:b::c"),
                         ['', ':', 'a', ':b::', 'c'])
        self.assertEqual(re.split("(b)|(:+)", ":a:b::c"),
                         ['', None, ':', 'a', None, ':', '', 'b', None, '',
                          None, '::', 'c'])
        self.assertEqual(re.split("(?:b)|(?::+)", ":a:b::c"),
                         ['', 'a', '', '', 'c'])

        for sep, expected in [
            (':*', ['', '', 'a', '', 'b', '', 'c', '']),
            ('(?::*)', ['', '', 'a', '', 'b', '', 'c', '']),
            ('(:*)', ['', ':', '', '', 'a', ':', '', '', 'b', '::', '', '', 'c', '', '']),
            ('(:)*', ['', ':', '', None, 'a', ':', '', None, 'b', ':', '', None, 'c', None, '']),
        ]:
            with self.subTest(sep=sep):
                self.assertTypedEqual(re.split(sep, ':a:b::c'), expected)

        for sep, expected in [
            ('', ['', ':', 'a', ':', 'b', ':', ':', 'c', '']),
            (r'\b', [':', 'a', ':', 'b', '::', 'c', '']),
            (r'(?=:)', ['', ':a', ':b', ':', ':c']),
            (r'(?<=:)', [':', 'a:', 'b:', ':', 'c']),
        ]:
            with self.subTest(sep=sep):
                self.assertTypedEqual(re.split(sep, ':a:b::c'), expected)

    def test_qualified_re_split(self):
        with self.assertWarns(DeprecationWarning) as w: