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3174 lines (2843 loc) · 149 KB
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from test.support import (gc_collect, bigmemtest, _2G,
cpython_only, captured_stdout,
check_disallow_instantiation, is_emscripten, is_wasi,
warnings_helper, SHORT_TIMEOUT, CPUStopwatch, requires_resource)
import locale
import re
import string
import sys
import time
import unittest
import warnings
from re import Scanner
from weakref import proxy
# some platforms lack working multiprocessing
try:
import _multiprocessing
except ImportError:
multiprocessing = None
else:
import multiprocessing
# Misc tests from Tim Peters' re.doc
# WARNING: Don't change details in these tests if you don't know
# what you're doing. Some of these tests were carefully modeled to
# cover most of the code.
class S(str):
def __getitem__(self, index):
return S(super().__getitem__(index))
class B(bytes):
def __getitem__(self, index):
return B(super().__getitem__(index))
class ReTests(unittest.TestCase):
def assertTypedEqual(self, actual, expect, msg=None):
self.assertEqual(actual, expect, msg)
def recurse(actual, expect):
if isinstance(expect, (tuple, list)):
for x, y in zip(actual, expect):
recurse(x, y)
else:
self.assertIs(type(actual), type(expect), msg)
recurse(actual, expect)
def checkPatternError(self, pattern, errmsg, pos=None):
with self.assertRaises(re.PatternError) as cm:
re.compile(pattern)
with self.subTest(pattern=pattern):
err = cm.exception
self.assertEqual(err.msg, errmsg)
if pos is not None:
self.assertEqual(err.pos, pos)
def checkTemplateError(self, pattern, repl, string, errmsg, pos=None):
with self.assertRaises(re.PatternError) as cm:
re.sub(pattern, repl, string)
with self.subTest(pattern=pattern, repl=repl):
err = cm.exception
self.assertEqual(err.msg, errmsg)
if pos is not None:
self.assertEqual(err.pos, pos)
def test_error_is_PatternError_alias(self):
assert re.error is re.PatternError
def test_keep_buffer(self):
# See bug 14212
b = bytearray(b'x')
it = re.finditer(b'a', b)
with self.assertRaises(BufferError):
b.extend(b'x'*400)
list(it)
del it
gc_collect()
b.extend(b'x'*400)
def test_weakref(self):
s = 'QabbbcR'
x = re.compile('ab+c')
y = proxy(x)
self.assertEqual(x.findall('QabbbcR'), y.findall('QabbbcR'))
def test_search_star_plus(self):
self.assertEqual(re.search('x*', 'axx').span(0), (0, 0))
self.assertEqual(re.search('x*', 'axx').span(), (0, 0))
self.assertEqual(re.search('x+', 'axx').span(0), (1, 3))
self.assertEqual(re.search('x+', 'axx').span(), (1, 3))
self.assertIsNone(re.search('x', 'aaa'))
self.assertEqual(re.match('a*', 'xxx').span(0), (0, 0))
self.assertEqual(re.match('a*', 'xxx').span(), (0, 0))
self.assertEqual(re.match('x*', 'xxxa').span(0), (0, 3))
self.assertEqual(re.match('x*', 'xxxa').span(), (0, 3))
self.assertIsNone(re.match('a+', 'xxx'))
def test_branching(self):
"""Test Branching
Test expressions using the OR ('|') operator."""
self.assertEqual(re.match('(ab|ba)', 'ab').span(), (0, 2))
self.assertEqual(re.match('(ab|ba)', 'ba').span(), (0, 2))
self.assertEqual(re.match('(abc|bac|ca|cb)', 'abc').span(),
(0, 3))
self.assertEqual(re.match('(abc|bac|ca|cb)', 'bac').span(),
(0, 3))
self.assertEqual(re.match('(abc|bac|ca|cb)', 'ca').span(),
(0, 2))
self.assertEqual(re.match('(abc|bac|ca|cb)', 'cb').span(),
(0, 2))
self.assertEqual(re.match('((a)|(b)|(c))', 'a').span(), (0, 1))
self.assertEqual(re.match('((a)|(b)|(c))', 'b').span(), (0, 1))
self.assertEqual(re.match('((a)|(b)|(c))', 'c').span(), (0, 1))
def bump_num(self, matchobj):
int_value = int(matchobj.group(0))
return str(int_value + 1)
def test_basic_re_sub(self):
self.assertTypedEqual(re.sub('y', 'a', 'xyz'), 'xaz')
self.assertTypedEqual(re.sub('y', S('a'), S('xyz')), 'xaz')
self.assertTypedEqual(re.sub(b'y', b'a', b'xyz'), b'xaz')
self.assertTypedEqual(re.sub(b'y', B(b'a'), B(b'xyz')), b'xaz')
self.assertTypedEqual(re.sub(b'y', bytearray(b'a'), bytearray(b'xyz')), b'xaz')
self.assertTypedEqual(re.sub(b'y', memoryview(b'a'), memoryview(b'xyz')), b'xaz')
for y in ("\xe0", "\u0430", "\U0001d49c"):
self.assertEqual(re.sub(y, 'a', 'x%sz' % y), 'xaz')
self.assertEqual(re.sub("(?i)b+", "x", "bbbb BBBB"), 'x x')
self.assertEqual(re.sub(r'\d+', self.bump_num, '08.2 -2 23x99y'),
'9.3 -3 24x100y')
with self.assertWarns(DeprecationWarning) as w:
self.assertEqual(re.sub(r'\d+', self.bump_num, '08.2 -2 23x99y', 3),
'9.3 -3 23x99y')
self.assertEqual(w.filename, __file__)
self.assertEqual(re.sub(r'\d+', self.bump_num, '08.2 -2 23x99y', count=3),
'9.3 -3 23x99y')
self.assertEqual(re.sub('.', lambda m: r"\n", 'x'), '\\n')
self.assertEqual(re.sub('.', r"\n", 'x'), '\n')
s = r"\1\1"
self.assertEqual(re.sub('(.)', s, 'x'), 'xx')
self.assertEqual(re.sub('(.)', s.replace('\\', r'\\'), 'x'), s)
self.assertEqual(re.sub('(.)', lambda m: s, 'x'), s)
self.assertEqual(re.sub('(?P<a>x)', r'\g<a>\g<a>', 'xx'), 'xxxx')
self.assertEqual(re.sub('(?P<a>x)', r'\g<a>\g<1>', 'xx'), 'xxxx')
self.assertEqual(re.sub('(?P<unk>x)', r'\g<unk>\g<unk>', 'xx'), 'xxxx')
self.assertEqual(re.sub('(?P<unk>x)', r'\g<1>\g<1>', 'xx'), 'xxxx')
self.assertEqual(re.sub('()x', r'\g<0>\g<0>', 'xx'), 'xxxx')
self.assertEqual(re.sub('a', r'\t\n\v\r\f\a\b', 'a'), '\t\n\v\r\f\a\b')
self.assertEqual(re.sub('a', '\t\n\v\r\f\a\b', 'a'), '\t\n\v\r\f\a\b')
self.assertEqual(re.sub('a', '\t\n\v\r\f\a\b', 'a'),
(chr(9)+chr(10)+chr(11)+chr(13)+chr(12)+chr(7)+chr(8)))
for c in 'cdehijklmopqsuwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ':
with self.subTest(c):
with self.assertRaises(re.PatternError):
self.assertEqual(re.sub('a', '\\' + c, 'a'), '\\' + c)
self.assertEqual(re.sub(r'^\s*', 'X', 'test'), 'Xtest')
def test_bug_449964(self):
# fails for group followed by other escape
self.assertEqual(re.sub(r'(?P<unk>x)', r'\g<1>\g<1>\b', 'xx'),
'xx\bxx\b')
def test_bug_449000(self):
# Test for sub() on escaped characters
self.assertEqual(re.sub(r'\r\n', r'\n', 'abc\r\ndef\r\n'),
'abc\ndef\n')
self.assertEqual(re.sub('\r\n', r'\n', 'abc\r\ndef\r\n'),
'abc\ndef\n')
self.assertEqual(re.sub(r'\r\n', '\n', 'abc\r\ndef\r\n'),
'abc\ndef\n')
self.assertEqual(re.sub('\r\n', '\n', 'abc\r\ndef\r\n'),
'abc\ndef\n')
def test_bug_1661(self):
# Verify that flags do not get silently ignored with compiled patterns
pattern = re.compile('.')
self.assertRaises(ValueError, re.match, pattern, 'A', re.I)
self.assertRaises(ValueError, re.search, pattern, 'A', re.I)
self.assertRaises(ValueError, re.findall, pattern, 'A', re.I)
self.assertRaises(ValueError, re.compile, pattern, re.I)
def test_bug_3629(self):
# A regex that triggered a bug in the sre-code validator
re.compile("(?P<quote>)(?(quote))")
def test_sub_template_numeric_escape(self):
# bug 776311 and friends
self.assertEqual(re.sub('x', r'\0', 'x'), '\0')
self.assertEqual(re.sub('x', r'\000', 'x'), '\000')
self.assertEqual(re.sub('x', r'\001', 'x'), '\001')
self.assertEqual(re.sub('x', r'\008', 'x'), '\0' + '8')
self.assertEqual(re.sub('x', r'\009', 'x'), '\0' + '9')
self.assertEqual(re.sub('x', r'\111', 'x'), '\111')
self.assertEqual(re.sub('x', r'\117', 'x'), '\117')
self.assertEqual(re.sub('x', r'\377', 'x'), '\377')
self.assertEqual(re.sub('x', r'\1111', 'x'), '\1111')
self.assertEqual(re.sub('x', r'\1111', 'x'), '\111' + '1')
self.assertEqual(re.sub('x', r'\00', 'x'), '\x00')
self.assertEqual(re.sub('x', r'\07', 'x'), '\x07')
self.assertEqual(re.sub('x', r'\08', 'x'), '\0' + '8')
self.assertEqual(re.sub('x', r'\09', 'x'), '\0' + '9')
self.assertEqual(re.sub('x', r'\0a', 'x'), '\0' + 'a')
self.checkTemplateError('x', r'\400', 'x',
r'octal escape value \400 outside of '
r'range 0-0o377', 0)
self.checkTemplateError('x', r'\777', 'x',
r'octal escape value \777 outside of '
r'range 0-0o377', 0)
self.checkTemplateError('x', r'\1', 'x', 'invalid group reference 1', 1)
self.checkTemplateError('x', r'\8', 'x', 'invalid group reference 8', 1)
self.checkTemplateError('x', r'\9', 'x', 'invalid group reference 9', 1)
self.checkTemplateError('x', r'\11', 'x', 'invalid group reference 11', 1)
self.checkTemplateError('x', r'\18', 'x', 'invalid group reference 18', 1)
self.checkTemplateError('x', r'\1a', 'x', 'invalid group reference 1', 1)
self.checkTemplateError('x', r'\90', 'x', 'invalid group reference 90', 1)
self.checkTemplateError('x', r'\99', 'x', 'invalid group reference 99', 1)
self.checkTemplateError('x', r'\118', 'x', 'invalid group reference 11', 1)
self.checkTemplateError('x', r'\11a', 'x', 'invalid group reference 11', 1)
self.checkTemplateError('x', r'\181', 'x', 'invalid group reference 18', 1)
self.checkTemplateError('x', r'\800', 'x', 'invalid group reference 80', 1)
self.checkTemplateError('x', r'\8', '', 'invalid group reference 8', 1)
# in python2.3 (etc), these loop endlessly in sre_parser.py
self.assertEqual(re.sub('(((((((((((x)))))))))))', r'\11', 'x'), 'x')
self.assertEqual(re.sub('((((((((((y))))))))))(.)', r'\118', 'xyz'),
'xz8')
self.assertEqual(re.sub('((((((((((y))))))))))(.)', r'\11a', 'xyz'),
'xza')
def test_qualified_re_sub(self):
self.assertEqual(re.sub('a', 'b', 'aaaaa'), 'bbbbb')
with self.assertWarns(DeprecationWarning) as w:
self.assertEqual(re.sub('a', 'b', 'aaaaa', 1), 'baaaa')
self.assertEqual(w.filename, __file__)
self.assertEqual(re.sub('a', 'b', 'aaaaa', count=1), 'baaaa')
with self.assertRaisesRegex(TypeError,
r"sub\(\) got multiple values for argument 'count'"):
re.sub('a', 'b', 'aaaaa', 1, count=1)
with self.assertRaisesRegex(TypeError,
r"sub\(\) got multiple values for argument 'flags'"):
re.sub('a', 'b', 'aaaaa', 1, 0, flags=0)
with self.assertRaisesRegex(TypeError,
r"sub\(\) takes from 3 to 5 positional arguments but 6 "
r"were given"):
re.sub('a', 'b', 'aaaaa', 1, 0, 0)
def test_misuse_flags(self):
with self.assertWarns(DeprecationWarning) as w:
result = re.sub('a', 'b', 'aaaaa', re.I)
self.assertEqual(result, re.sub('a', 'b', 'aaaaa', count=int(re.I)))
self.assertEqual(str(w.warning),
"'count' is passed as positional argument")
self.assertEqual(w.filename, __file__)
with self.assertWarns(DeprecationWarning) as w:
result = re.subn("b*", "x", "xyz", re.I)
self.assertEqual(result, re.subn("b*", "x", "xyz", count=int(re.I)))
self.assertEqual(str(w.warning),
"'count' is passed as positional argument")
self.assertEqual(w.filename, __file__)
with self.assertWarns(DeprecationWarning) as w:
result = re.split(":", ":a:b::c", re.I)
self.assertEqual(result, re.split(":", ":a:b::c", maxsplit=int(re.I)))
self.assertEqual(str(w.warning),
"'maxsplit' is passed as positional argument")
self.assertEqual(w.filename, __file__)
def test_bug_114660(self):
self.assertEqual(re.sub(r'(\S)\s+(\S)', r'\1 \2', 'hello there'),
'hello there')
def test_symbolic_groups(self):
re.compile(r'(?P<a>x)(?P=a)(?(a)y)')
re.compile(r'(?P<a1>x)(?P=a1)(?(a1)y)')
re.compile(r'(?P<a1>x)\1(?(1)y)')
re.compile(b'(?P<a1>x)(?P=a1)(?(a1)y)')
# New valid identifiers in Python 3
re.compile('(?P<µ>x)(?P=µ)(?(µ)y)')
re.compile('(?P<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>x)(?P=𝔘𝔫𝔦𝔠𝔬𝔡𝔢)(?(𝔘𝔫𝔦𝔠𝔬𝔡𝔢)y)')
# Support > 100 groups.
pat = '|'.join('x(?P<a%d>%x)y' % (i, i) for i in range(1, 200 + 1))
pat = '(?:%s)(?(200)z|t)' % pat
self.assertEqual(re.match(pat, 'xc8yz').span(), (0, 5))
def test_symbolic_groups_errors(self):
self.checkPatternError(r'(?P<a>)(?P<a>)',
"redefinition of group name 'a' as group 2; "
"was group 1")
self.checkPatternError(r'(?P<a>(?P=a))',
"cannot refer to an open group", 10)
self.checkPatternError(r'(?Pxy)', 'unknown extension ?Px')
self.checkPatternError(r'(?P<a>)(?P=a', 'missing ), unterminated name', 11)
self.checkPatternError(r'(?P=', 'missing group name', 4)
self.checkPatternError(r'(?P=)', 'missing group name', 4)
self.checkPatternError(r'(?P=1)', "bad character in group name '1'", 4)
self.checkPatternError(r'(?P=a)', "unknown group name 'a'")
self.checkPatternError(r'(?P=a1)', "unknown group name 'a1'")
self.checkPatternError(r'(?P=a.)', "bad character in group name 'a.'", 4)
self.checkPatternError(r'(?P<)', 'missing >, unterminated name', 4)
self.checkPatternError(r'(?P<a', 'missing >, unterminated name', 4)
self.checkPatternError(r'(?P<', 'missing group name', 4)
self.checkPatternError(r'(?P<>)', 'missing group name', 4)
self.checkPatternError(r'(?P<1>)', "bad character in group name '1'", 4)
self.checkPatternError(r'(?P<a.>)', "bad character in group name 'a.'", 4)
self.checkPatternError(r'(?(', 'missing group name', 3)
self.checkPatternError(r'(?())', 'missing group name', 3)
self.checkPatternError(r'(?(a))', "unknown group name 'a'", 3)
self.checkPatternError(r'(?(-1))', "bad character in group name '-1'", 3)
self.checkPatternError(r'(?(1a))', "bad character in group name '1a'", 3)
self.checkPatternError(r'(?(a.))', "bad character in group name 'a.'", 3)
self.checkPatternError('(?P<©>x)', "bad character in group name '©'", 4)
self.checkPatternError('(?P=©)', "bad character in group name '©'", 4)
self.checkPatternError('(?(©)y)', "bad character in group name '©'", 3)
self.checkPatternError(b'(?P<\xc2\xb5>x)',
r"bad character in group name '\xc2\xb5'", 4)
self.checkPatternError(b'(?P=\xc2\xb5)',
r"bad character in group name '\xc2\xb5'", 4)
self.checkPatternError(b'(?(\xc2\xb5)y)',
r"bad character in group name '\xc2\xb5'", 3)
def test_symbolic_refs(self):
self.assertEqual(re.sub('(?P<a>x)|(?P<b>y)', r'\g<b>', 'xx'), '')
self.assertEqual(re.sub('(?P<a>x)|(?P<b>y)', r'\2', 'xx'), '')
self.assertEqual(re.sub(b'(?P<a1>x)', br'\g<a1>', b'xx'), b'xx')
# New valid identifiers in Python 3
self.assertEqual(re.sub('(?P<µ>x)', r'\g<µ>', 'xx'), 'xx')
self.assertEqual(re.sub('(?P<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>x)', r'\g<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>', 'xx'), 'xx')
# Support > 100 groups.
pat = '|'.join('x(?P<a%d>%x)y' % (i, i) for i in range(1, 200 + 1))
self.assertEqual(re.sub(pat, r'\g<200>', 'xc8yzxc8y'), 'c8zc8')
def test_symbolic_refs_errors(self):
self.checkTemplateError('(?P<a>x)', r'\g<a', 'xx',
'missing >, unterminated name', 3)
self.checkTemplateError('(?P<a>x)', r'\g<', 'xx',
'missing group name', 3)
self.checkTemplateError('(?P<a>x)', r'\g', 'xx', 'missing <', 2)
self.checkTemplateError('(?P<a>x)', r'\g<a a>', 'xx',
"bad character in group name 'a a'", 3)
self.checkTemplateError('(?P<a>x)', r'\g<>', 'xx',
'missing group name', 3)
self.checkTemplateError('(?P<a>x)', r'\g<1a1>', 'xx',
"bad character in group name '1a1'", 3)
self.checkTemplateError('(?P<a>x)', r'\g<2>', 'xx',
'invalid group reference 2', 3)
self.checkTemplateError('(?P<a>x)', r'\2', 'xx',
'invalid group reference 2', 1)
with self.assertRaisesRegex(IndexError, "unknown group name 'ab'"):
re.sub('(?P<a>x)', r'\g<ab>', 'xx')
self.checkTemplateError('(?P<a>x)', r'\g<-1>', 'xx',
"bad character in group name '-1'", 3)
self.checkTemplateError('(?P<a>x)', r'\g<+1>', 'xx',
"bad character in group name '+1'", 3)
self.checkTemplateError('()'*10, r'\g<1_0>', 'xx',
"bad character in group name '1_0'", 3)
self.checkTemplateError('(?P<a>x)', r'\g< 1 >', 'xx',
"bad character in group name ' 1 '", 3)
self.checkTemplateError('(?P<a>x)', r'\g<©>', 'xx',
"bad character in group name '©'", 3)
self.checkTemplateError(b'(?P<a>x)', b'\\g<\xc2\xb5>', b'xx',
r"bad character in group name '\xc2\xb5'", 3)
self.checkTemplateError('(?P<a>x)', r'\g<㊀>', 'xx',
"bad character in group name '㊀'", 3)
self.checkTemplateError('(?P<a>x)', r'\g<¹>', 'xx',
"bad character in group name '¹'", 3)
self.checkTemplateError('(?P<a>x)', r'\g<१>', 'xx',
"bad character in group name '१'", 3)
def test_re_subn(self):
self.assertEqual(re.subn("(?i)b+", "x", "bbbb BBBB"), ('x x', 2))
self.assertEqual(re.subn("b+", "x", "bbbb BBBB"), ('x BBBB', 1))
self.assertEqual(re.subn("b+", "x", "xyz"), ('xyz', 0))
self.assertEqual(re.subn("b*", "x", "xyz"), ('xxxyxzx', 4))
with self.assertWarns(DeprecationWarning) as w:
self.assertEqual(re.subn("b*", "x", "xyz", 2), ('xxxyz', 2))
self.assertEqual(w.filename, __file__)
self.assertEqual(re.subn("b*", "x", "xyz", count=2), ('xxxyz', 2))
with self.assertRaisesRegex(TypeError,
r"subn\(\) got multiple values for argument 'count'"):
re.subn('a', 'b', 'aaaaa', 1, count=1)
with self.assertRaisesRegex(TypeError,
r"subn\(\) got multiple values for argument 'flags'"):
re.subn('a', 'b', 'aaaaa', 1, 0, flags=0)
with self.assertRaisesRegex(TypeError,
r"subn\(\) takes from 3 to 5 positional arguments but 6 "
r"were given"):
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:
self.assertEqual(re.split(":", ":a:b::c", 2), ['', 'a', 'b::c'])
self.assertEqual(w.filename, __file__)
self.assertEqual(re.split(":", ":a:b::c", maxsplit=2), ['', 'a', 'b::c'])
self.assertEqual(re.split(':', 'a:b:c:d', maxsplit=2), ['a', 'b', 'c:d'])
self.assertEqual(re.split("(:)", ":a:b::c", maxsplit=2),
['', ':', 'a', ':', 'b::c'])
self.assertEqual(re.split("(:+)", ":a:b::c", maxsplit=2),
['', ':', 'a', ':', 'b::c'])
self.assertEqual(re.split("(:*)", ":a:b::c", maxsplit=2),
['', ':', '', '', 'a:b::c'])
with self.assertRaisesRegex(TypeError,
r"split\(\) got multiple values for argument 'maxsplit'"):
re.split(":", ":a:b::c", 2, maxsplit=2)
with self.assertRaisesRegex(TypeError,
r"split\(\) got multiple values for argument 'flags'"):
re.split(":", ":a:b::c", 2, 0, flags=0)
with self.assertRaisesRegex(TypeError,
r"split\(\) takes from 2 to 4 positional arguments but 5 "
r"were given"):
re.split(":", ":a:b::c", 2, 0, 0)
def test_re_findall(self):
self.assertEqual(re.findall(":+", "abc"), [])
for string in "a:b::c:::d", S("a:b::c:::d"):
self.assertTypedEqual(re.findall(":+", string),
[":", "::", ":::"])
self.assertTypedEqual(re.findall("(:+)", string),
[":", "::", ":::"])
self.assertTypedEqual(re.findall("(:)(:*)", string),
[(":", ""), (":", ":"), (":", "::")])
for string in (b"a:b::c:::d", B(b"a:b::c:::d"), bytearray(b"a:b::c:::d"),
memoryview(b"a:b::c:::d")):
self.assertTypedEqual(re.findall(b":+", string),
[b":", b"::", b":::"])
self.assertTypedEqual(re.findall(b"(:+)", string),
[b":", b"::", b":::"])
self.assertTypedEqual(re.findall(b"(:)(:*)", string),
[(b":", b""), (b":", b":"), (b":", b"::")])
for x in ("\xe0", "\u0430", "\U0001d49c"):
xx = x * 2
xxx = x * 3
string = "a%sb%sc%sd" % (x, xx, xxx)
self.assertEqual(re.findall("%s+" % x, string), [x, xx, xxx])
self.assertEqual(re.findall("(%s+)" % x, string), [x, xx, xxx])
self.assertEqual(re.findall("(%s)(%s*)" % (x, x), string),
[(x, ""), (x, x), (x, xx)])
def test_bug_117612(self):
self.assertEqual(re.findall(r"(a|(b))", "aba"),
[("a", ""),("b", "b"),("a", "")])
def test_re_match(self):
for string in 'a', S('a'):
self.assertEqual(re.match('a', string).groups(), ())
self.assertEqual(re.match('(a)', string).groups(), ('a',))
self.assertEqual(re.match('(a)', string).group(0), 'a')
self.assertEqual(re.match('(a)', string).group(1), 'a')
self.assertEqual(re.match('(a)', string).group(1, 1), ('a', 'a'))
for string in b'a', B(b'a'), bytearray(b'a'), memoryview(b'a'):
self.assertEqual(re.match(b'a', string).groups(), ())
self.assertEqual(re.match(b'(a)', string).groups(), (b'a',))
self.assertEqual(re.match(b'(a)', string).group(0), b'a')
self.assertEqual(re.match(b'(a)', string).group(1), b'a')
self.assertEqual(re.match(b'(a)', string).group(1, 1), (b'a', b'a'))
for a in ("\xe0", "\u0430", "\U0001d49c"):
self.assertEqual(re.match(a, a).groups(), ())
self.assertEqual(re.match('(%s)' % a, a).groups(), (a,))
self.assertEqual(re.match('(%s)' % a, a).group(0), a)
self.assertEqual(re.match('(%s)' % a, a).group(1), a)
self.assertEqual(re.match('(%s)' % a, a).group(1, 1), (a, a))
pat = re.compile('((a)|(b))(c)?')
self.assertEqual(pat.match('a').groups(), ('a', 'a', None, None))
self.assertEqual(pat.match('b').groups(), ('b', None, 'b', None))
self.assertEqual(pat.match('ac').groups(), ('a', 'a', None, 'c'))
self.assertEqual(pat.match('bc').groups(), ('b', None, 'b', 'c'))
self.assertEqual(pat.match('bc').groups(""), ('b', "", 'b', 'c'))
pat = re.compile('(?:(?P<a1>a)|(?P<b2>b))(?P<c3>c)?')
self.assertEqual(pat.match('a').group(1, 2, 3), ('a', None, None))
self.assertEqual(pat.match('b').group('a1', 'b2', 'c3'),
(None, 'b', None))
self.assertEqual(pat.match('ac').group(1, 'b2', 3), ('a', None, 'c'))
def test_group(self):
class Index:
def __init__(self, value):
self.value = value
def __index__(self):
return self.value
# A single group
m = re.match('(a)(b)', 'ab')
self.assertEqual(m.group(), 'ab')
self.assertEqual(m.group(0), 'ab')
self.assertEqual(m.group(1), 'a')
self.assertEqual(m.group(Index(1)), 'a')
self.assertRaises(IndexError, m.group, -1)
self.assertRaises(IndexError, m.group, 3)
self.assertRaises(IndexError, m.group, 1<<1000)
self.assertRaises(IndexError, m.group, Index(1<<1000))
self.assertRaises(IndexError, m.group, 'x')
# Multiple groups
self.assertEqual(m.group(2, 1), ('b', 'a'))
self.assertEqual(m.group(Index(2), Index(1)), ('b', 'a'))
def test_match_getitem(self):
pat = re.compile('(?:(?P<a1>a)|(?P<b2>b))(?P<c3>c)?')
m = pat.match('a')
self.assertEqual(m['a1'], 'a')
self.assertEqual(m['b2'], None)
self.assertEqual(m['c3'], None)
self.assertEqual('a1={a1} b2={b2} c3={c3}'.format_map(m), 'a1=a b2=None c3=None')
self.assertEqual(m[0], 'a')
self.assertEqual(m[1], 'a')
self.assertEqual(m[2], None)
self.assertEqual(m[3], None)
with self.assertRaisesRegex(IndexError, 'no such group'):
m['X']
with self.assertRaisesRegex(IndexError, 'no such group'):
m[-1]
with self.assertRaisesRegex(IndexError, 'no such group'):
m[4]
with self.assertRaisesRegex(IndexError, 'no such group'):
m[0, 1]
with self.assertRaisesRegex(IndexError, 'no such group'):
m[(0,)]
with self.assertRaisesRegex(IndexError, 'no such group'):
m[(0, 1)]
with self.assertRaisesRegex(IndexError, 'no such group'):
'a1={a2}'.format_map(m)
m = pat.match('ac')
self.assertEqual(m['a1'], 'a')
self.assertEqual(m['b2'], None)
self.assertEqual(m['c3'], 'c')
self.assertEqual('a1={a1} b2={b2} c3={c3}'.format_map(m), 'a1=a b2=None c3=c')
self.assertEqual(m[0], 'ac')
self.assertEqual(m[1], 'a')
self.assertEqual(m[2], None)
self.assertEqual(m[3], 'c')
# Cannot assign.
with self.assertRaises(TypeError):
m[0] = 1
# No len().
self.assertRaises(TypeError, len, m)
def test_re_fullmatch(self):
# Issue 16203: Proposal: add re.fullmatch() method.
self.assertEqual(re.fullmatch(r"a", "a").span(), (0, 1))
for string in "ab", S("ab"):
self.assertEqual(re.fullmatch(r"a|ab", string).span(), (0, 2))
for string in b"ab", B(b"ab"), bytearray(b"ab"), memoryview(b"ab"):
self.assertEqual(re.fullmatch(br"a|ab", string).span(), (0, 2))
for a, b in "\xe0\xdf", "\u0430\u0431", "\U0001d49c\U0001d49e":
r = r"%s|%s" % (a, a + b)
self.assertEqual(re.fullmatch(r, a + b).span(), (0, 2))
self.assertEqual(re.fullmatch(r".*?$", "abc").span(), (0, 3))
self.assertEqual(re.fullmatch(r".*?", "abc").span(), (0, 3))
self.assertEqual(re.fullmatch(r"a.*?b", "ab").span(), (0, 2))
self.assertEqual(re.fullmatch(r"a.*?b", "abb").span(), (0, 3))
self.assertEqual(re.fullmatch(r"a.*?b", "axxb").span(), (0, 4))
self.assertIsNone(re.fullmatch(r"a+", "ab"))
self.assertIsNone(re.fullmatch(r"abc$", "abc\n"))
self.assertIsNone(re.fullmatch(r"abc\Z", "abc\n"))
self.assertIsNone(re.fullmatch(r"(?m)abc$", "abc\n"))
self.assertEqual(re.fullmatch(r"ab(?=c)cd", "abcd").span(), (0, 4))
self.assertEqual(re.fullmatch(r"ab(?<=b)cd", "abcd").span(), (0, 4))
self.assertEqual(re.fullmatch(r"(?=a|ab)ab", "ab").span(), (0, 2))
self.assertEqual(
re.compile(r"bc").fullmatch("abcd", pos=1, endpos=3).span(), (1, 3))
self.assertEqual(
re.compile(r".*?$").fullmatch("abcd", pos=1, endpos=3).span(), (1, 3))
self.assertEqual(
re.compile(r".*?").fullmatch("abcd", pos=1, endpos=3).span(), (1, 3))
def test_re_groupref_exists(self):
self.assertEqual(re.match(r'^(\()?([^()]+)(?(1)\))$', '(a)').groups(),
('(', 'a'))
self.assertEqual(re.match(r'^(\()?([^()]+)(?(1)\))$', 'a').groups(),
(None, 'a'))
self.assertIsNone(re.match(r'^(\()?([^()]+)(?(1)\))$', 'a)'))
self.assertIsNone(re.match(r'^(\()?([^()]+)(?(1)\))$', '(a'))
self.assertEqual(re.match('^(?:(a)|c)((?(1)b|d))$', 'ab').groups(),
('a', 'b'))
self.assertEqual(re.match(r'^(?:(a)|c)((?(1)b|d))$', 'cd').groups(),
(None, 'd'))
self.assertEqual(re.match(r'^(?:(a)|c)((?(1)|d))$', 'cd').groups(),
(None, 'd'))
self.assertEqual(re.match(r'^(?:(a)|c)((?(1)|d))$', 'a').groups(),
('a', ''))
# Tests for bug #1177831: exercise groups other than the first group
p = re.compile('(?P<g1>a)(?P<g2>b)?((?(g2)c|d))')
self.assertEqual(p.match('abc').groups(),
('a', 'b', 'c'))
self.assertEqual(p.match('ad').groups(),
('a', None, 'd'))
self.assertIsNone(p.match('abd'))
self.assertIsNone(p.match('ac'))
# Support > 100 groups.
pat = '|'.join('x(?P<a%d>%x)y' % (i, i) for i in range(1, 200 + 1))
pat = '(?:%s)(?(200)z)' % pat
self.assertEqual(re.match(pat, 'xc8yz').span(), (0, 5))
def test_re_groupref_exists_errors(self):
self.checkPatternError(r'(?P<a>)(?(0)a|b)', 'bad group number', 10)
self.checkPatternError(r'()(?(-1)a|b)',
"bad character in group name '-1'", 5)
self.checkPatternError(r'()(?(+1)a|b)',
"bad character in group name '+1'", 5)
self.checkPatternError(r'()'*10 + r'(?(1_0)a|b)',
"bad character in group name '1_0'", 23)
self.checkPatternError(r'()(?( 1 )a|b)',
"bad character in group name ' 1 '", 5)
self.checkPatternError(r'()(?(㊀)a|b)',
"bad character in group name '㊀'", 5)
self.checkPatternError(r'()(?(¹)a|b)',
"bad character in group name '¹'", 5)
self.checkPatternError(r'()(?(१)a|b)',
"bad character in group name '१'", 5)
self.checkPatternError(r'()(?(1',
"missing ), unterminated name", 5)
self.checkPatternError(r'()(?(1)a',
"missing ), unterminated subpattern", 2)
self.checkPatternError(r'()(?(1)a|b',
'missing ), unterminated subpattern', 2)
self.checkPatternError(r'()(?(1)a|b|c',
'conditional backref with more than '
'two branches', 10)
self.checkPatternError(r'()(?(1)a|b|c)',
'conditional backref with more than '
'two branches', 10)
self.checkPatternError(r'()(?(2)a)',
"invalid group reference 2", 5)
def test_re_groupref_exists_validation_bug(self):
for i in range(256):
with self.subTest(code=i):
re.compile(r'()(?(1)\x%02x?)' % i)
def test_re_groupref_overflow(self):
from re._constants import MAXGROUPS
self.checkTemplateError('()', r'\g<%s>' % MAXGROUPS, 'xx',
'invalid group reference %d' % MAXGROUPS, 3)
self.checkPatternError(r'(?P<a>)(?(%d))' % MAXGROUPS,
'invalid group reference %d' % MAXGROUPS, 10)
def test_re_groupref(self):
self.assertEqual(re.match(r'^(\|)?([^()]+)\1$', '|a|').groups(),
('|', 'a'))
self.assertEqual(re.match(r'^(\|)?([^()]+)\1?$', 'a').groups(),
(None, 'a'))
self.assertIsNone(re.match(r'^(\|)?([^()]+)\1$', 'a|'))
self.assertIsNone(re.match(r'^(\|)?([^()]+)\1$', '|a'))
self.assertEqual(re.match(r'^(?:(a)|c)(\1)$', 'aa').groups(),
('a', 'a'))
self.assertEqual(re.match(r'^(?:(a)|c)(\1)?$', 'c').groups(),
(None, None))
self.checkPatternError(r'(abc\1)', 'cannot refer to an open group', 4)
def test_groupdict(self):
self.assertEqual(re.match('(?P<first>first) (?P<second>second)',
'first second').groupdict(),
{'first':'first', 'second':'second'})
def test_expand(self):
self.assertEqual(re.match("(?P<first>first) (?P<second>second)",
"first second")
.expand(r"\2 \1 \g<second> \g<first>"),
"second first second first")
self.assertEqual(re.match("(?P<first>first)|(?P<second>second)",
"first")
.expand(r"\2 \g<second>"),
" ")
def test_repeat_minmax(self):
self.assertIsNone(re.match(r"^(\w){1}$", "abc"))
self.assertIsNone(re.match(r"^(\w){1}?$", "abc"))
self.assertIsNone(re.match(r"^(\w){1,2}$", "abc"))
self.assertIsNone(re.match(r"^(\w){1,2}?$", "abc"))
self.assertEqual(re.match(r"^(\w){3}$", "abc").group(1), "c")
self.assertEqual(re.match(r"^(\w){1,3}$", "abc").group(1), "c")
self.assertEqual(re.match(r"^(\w){1,4}$", "abc").group(1), "c")
self.assertEqual(re.match(r"^(\w){3,4}?$", "abc").group(1), "c")
self.assertEqual(re.match(r"^(\w){3}?$", "abc").group(1), "c")
self.assertEqual(re.match(r"^(\w){1,3}?$", "abc").group(1), "c")
self.assertEqual(re.match(r"^(\w){1,4}?$", "abc").group(1), "c")
self.assertEqual(re.match(r"^(\w){3,4}?$", "abc").group(1), "c")
self.assertIsNone(re.match(r"^x{1}$", "xxx"))
self.assertIsNone(re.match(r"^x{1}?$", "xxx"))
self.assertIsNone(re.match(r"^x{1,2}$", "xxx"))
self.assertIsNone(re.match(r"^x{1,2}?$", "xxx"))
self.assertTrue(re.match(r"^x{3}$", "xxx"))
self.assertTrue(re.match(r"^x{1,3}$", "xxx"))
self.assertTrue(re.match(r"^x{3,3}$", "xxx"))
self.assertTrue(re.match(r"^x{1,4}$", "xxx"))
self.assertTrue(re.match(r"^x{3,4}?$", "xxx"))
self.assertTrue(re.match(r"^x{3}?$", "xxx"))
self.assertTrue(re.match(r"^x{1,3}?$", "xxx"))
self.assertTrue(re.match(r"^x{1,4}?$", "xxx"))
self.assertTrue(re.match(r"^x{3,4}?$", "xxx"))
self.assertIsNone(re.match(r"^x{}$", "xxx"))
self.assertTrue(re.match(r"^x{}$", "x{}"))
self.checkPatternError(r'x{2,1}',
'min repeat greater than max repeat', 2)
def test_getattr(self):
self.assertEqual(re.compile("(?i)(a)(b)").pattern, "(?i)(a)(b)")
self.assertEqual(re.compile("(?i)(a)(b)").flags, re.I | re.U)
self.assertEqual(re.compile("(?i)(a)(b)").groups, 2)
self.assertEqual(re.compile("(?i)(a)(b)").groupindex, {})
self.assertEqual(re.compile("(?i)(?P<first>a)(?P<other>b)").groupindex,
{'first': 1, 'other': 2})
self.assertEqual(re.match("(a)", "a").pos, 0)
self.assertEqual(re.match("(a)", "a").endpos, 1)
self.assertEqual(re.match("(a)", "a").string, "a")
self.assertEqual(re.match("(a)", "a").regs, ((0, 1), (0, 1)))
self.assertTrue(re.match("(a)", "a").re)
# Issue 14260. groupindex should be non-modifiable mapping.
p = re.compile(r'(?i)(?P<first>a)(?P<other>b)')
self.assertEqual(sorted(p.groupindex), ['first', 'other'])
self.assertEqual(p.groupindex['other'], 2)
with self.assertRaises(TypeError):
p.groupindex['other'] = 0
self.assertEqual(p.groupindex['other'], 2)
def test_special_escapes(self):
self.assertEqual(re.search(r"\b(b.)\b",
"abcd abc bcd bx").group(1), "bx")
self.assertEqual(re.search(r"\B(b.)\B",
"abc bcd bc abxd").group(1), "bx")
self.assertEqual(re.search(r"\b(b.)\b",
"abcd abc bcd bx", re.ASCII).group(1), "bx")
self.assertEqual(re.search(r"\B(b.)\B",
"abc bcd bc abxd", re.ASCII).group(1), "bx")
self.assertEqual(re.search(r"^abc$", "\nabc\n", re.M).group(0), "abc")
self.assertEqual(re.search(r"^\Aabc\Z$", "abc", re.M).group(0), "abc")
self.assertIsNone(re.search(r"^\Aabc\Z$", "\nabc\n", re.M))
self.assertEqual(re.search(br"\b(b.)\b",
b"abcd abc bcd bx").group(1), b"bx")
self.assertEqual(re.search(br"\B(b.)\B",
b"abc bcd bc abxd").group(1), b"bx")
self.assertEqual(re.search(br"\b(b.)\b",
b"abcd abc bcd bx", re.LOCALE).group(1), b"bx")
self.assertEqual(re.search(br"\B(b.)\B",
b"abc bcd bc abxd", re.LOCALE).group(1), b"bx")
self.assertEqual(re.search(br"^abc$", b"\nabc\n", re.M).group(0), b"abc")
self.assertEqual(re.search(br"^\Aabc\Z$", b"abc", re.M).group(0), b"abc")
self.assertIsNone(re.search(br"^\Aabc\Z$", b"\nabc\n", re.M))
self.assertEqual(re.search(r"\d\D\w\W\s\S",
"1aa! a").group(0), "1aa! a")
self.assertEqual(re.search(br"\d\D\w\W\s\S",
b"1aa! a").group(0), b"1aa! a")
self.assertEqual(re.search(r"\d\D\w\W\s\S",
"1aa! a", re.ASCII).group(0), "1aa! a")
self.assertEqual(re.search(br"\d\D\w\W\s\S",
b"1aa! a", re.LOCALE).group(0), b"1aa! a")
def test_other_escapes(self):
self.checkPatternError("\\", 'bad escape (end of pattern)', 0)
self.assertEqual(re.match(r"\(", '(').group(), '(')
self.assertIsNone(re.match(r"\(", ')'))
self.assertEqual(re.match(r"\\", '\\').group(), '\\')
self.assertEqual(re.match(r"[\]]", ']').group(), ']')
self.assertIsNone(re.match(r"[\]]", '['))
self.assertEqual(re.match(r"[a\-c]", '-').group(), '-')
self.assertIsNone(re.match(r"[a\-c]", 'b'))
self.assertEqual(re.match(r"[\^a]+", 'a^').group(), 'a^')
self.assertIsNone(re.match(r"[\^a]+", 'b'))
re.purge() # for warnings
for c in 'ceghijklmopqyzCEFGHIJKLMNOPQRTVXY':
with self.subTest(c):
self.assertRaises(re.PatternError, re.compile, '\\%c' % c)
for c in 'ceghijklmopqyzABCEFGHIJKLMNOPQRTVXYZ':
with self.subTest(c):
self.assertRaises(re.PatternError, re.compile, '[\\%c]' % c)
def test_named_unicode_escapes(self):
# test individual Unicode named escapes
self.assertTrue(re.match(r'\N{LESS-THAN SIGN}', '<'))
self.assertTrue(re.match(r'\N{less-than sign}', '<'))
self.assertIsNone(re.match(r'\N{LESS-THAN SIGN}', '>'))
self.assertTrue(re.match(r'\N{SNAKE}', '\U0001f40d'))
self.assertTrue(re.match(r'\N{ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH '
r'HAMZA ABOVE WITH ALEF MAKSURA ISOLATED FORM}',
'\ufbf9'))
self.assertTrue(re.match(r'[\N{LESS-THAN SIGN}-\N{GREATER-THAN SIGN}]',
'='))
self.assertIsNone(re.match(r'[\N{LESS-THAN SIGN}-\N{GREATER-THAN SIGN}]',
';'))
# test errors in \N{name} handling - only valid names should pass
self.checkPatternError(r'\N', 'missing {', 2)
self.checkPatternError(r'[\N]', 'missing {', 3)
self.checkPatternError(r'\N{', 'missing character name', 3)
self.checkPatternError(r'[\N{', 'missing character name', 4)
self.checkPatternError(r'\N{}', 'missing character name', 3)
self.checkPatternError(r'[\N{}]', 'missing character name', 4)
self.checkPatternError(r'\NSNAKE}', 'missing {', 2)
self.checkPatternError(r'[\NSNAKE}]', 'missing {', 3)
self.checkPatternError(r'\N{SNAKE',
'missing }, unterminated name', 3)
self.checkPatternError(r'[\N{SNAKE]',
'missing }, unterminated name', 4)
self.checkPatternError(r'[\N{SNAKE]}',
"undefined character name 'SNAKE]'", 1)
self.checkPatternError(r'\N{SPAM}',
"undefined character name 'SPAM'", 0)
self.checkPatternError(r'[\N{SPAM}]',
"undefined character name 'SPAM'", 1)
self.checkPatternError(r'\N{KEYCAP NUMBER SIGN}',
"undefined character name 'KEYCAP NUMBER SIGN'", 0)
self.checkPatternError(r'[\N{KEYCAP NUMBER SIGN}]',
"undefined character name 'KEYCAP NUMBER SIGN'", 1)
self.checkPatternError(br'\N{LESS-THAN SIGN}', r'bad escape \N', 0)
self.checkPatternError(br'[\N{LESS-THAN SIGN}]', r'bad escape \N', 1)
def test_word_boundaries(self):
# See http://bugs.python.org/issue10713
self.assertEqual(re.search(r"\b(abc)\b", "abc").group(1), "abc")
self.assertEqual(re.search(r"\b(abc)\b", "abc", re.ASCII).group(1), "abc")
self.assertEqual(re.search(br"\b(abc)\b", b"abc").group(1), b"abc")
self.assertEqual(re.search(br"\b(abc)\b", b"abc", re.LOCALE).group(1), b"abc")
self.assertEqual(re.search(r"\b(ьюя)\b", "ьюя").group(1), "ьюя")
self.assertIsNone(re.search(r"\b(ьюя)\b", "ьюя", re.ASCII))
# There's a word boundary between a word and a non-word.
self.assertTrue(re.match(r".\b", "a="))
self.assertTrue(re.match(r".\b", "a=", re.ASCII))
self.assertTrue(re.match(br".\b", b"a="))
self.assertTrue(re.match(br".\b", b"a=", re.LOCALE))
self.assertTrue(re.match(r".\b", "я="))
self.assertIsNone(re.match(r".\b", "я=", re.ASCII))
# There's a word boundary between a non-word and a word.
self.assertTrue(re.match(r".\b", "=a"))
self.assertTrue(re.match(r".\b", "=a", re.ASCII))
self.assertTrue(re.match(br".\b", b"=a"))
self.assertTrue(re.match(br".\b", b"=a", re.LOCALE))
self.assertTrue(re.match(r".\b", "=я"))
self.assertIsNone(re.match(r".\b", "=я", re.ASCII))
# There is no word boundary inside a word.
self.assertIsNone(re.match(r".\b", "ab"))
self.assertIsNone(re.match(r".\b", "ab", re.ASCII))
self.assertIsNone(re.match(br".\b", b"ab"))
self.assertIsNone(re.match(br".\b", b"ab", re.LOCALE))
self.assertIsNone(re.match(r".\b", "юя"))
self.assertIsNone(re.match(r".\b", "юя", re.ASCII))
# There is no word boundary between a non-word characters.
self.assertIsNone(re.match(r".\b", "=-"))
self.assertIsNone(re.match(r".\b", "=-", re.ASCII))
self.assertIsNone(re.match(br".\b", b"=-"))
self.assertIsNone(re.match(br".\b", b"=-", re.LOCALE))
# There is no non-boundary match between a word and a non-word.
self.assertIsNone(re.match(r".\B", "a="))
self.assertIsNone(re.match(r".\B", "a=", re.ASCII))
self.assertIsNone(re.match(br".\B", b"a="))
self.assertIsNone(re.match(br".\B", b"a=", re.LOCALE))
self.assertIsNone(re.match(r".\B", "я="))
self.assertTrue(re.match(r".\B", "я=", re.ASCII))
# There is no non-boundary match between a non-word and a word.
self.assertIsNone(re.match(r".\B", "=a"))
self.assertIsNone(re.match(r".\B", "=a", re.ASCII))
self.assertIsNone(re.match(br".\B", b"=a"))
self.assertIsNone(re.match(br".\B", b"=a", re.LOCALE))
self.assertIsNone(re.match(r".\B", "=я"))
self.assertTrue(re.match(r".\B", "=я", re.ASCII))
# There's a non-boundary match inside a word.
self.assertTrue(re.match(r".\B", "ab"))
self.assertTrue(re.match(r".\B", "ab", re.ASCII))
self.assertTrue(re.match(br".\B", b"ab"))
self.assertTrue(re.match(br".\B", b"ab", re.LOCALE))
self.assertTrue(re.match(r".\B", "юя"))
self.assertTrue(re.match(r".\B", "юя", re.ASCII))
# There's a non-boundary match between a non-word characters.
self.assertTrue(re.match(r".\B", "=-"))
self.assertTrue(re.match(r".\B", "=-", re.ASCII))
self.assertTrue(re.match(br".\B", b"=-"))
self.assertTrue(re.match(br".\B", b"=-", re.LOCALE))
# There's a word boundary at the start of a string.
self.assertTrue(re.match(r"\b", "abc"))
self.assertTrue(re.match(r"\b", "abc", re.ASCII))
self.assertTrue(re.match(br"\b", b"abc"))
self.assertTrue(re.match(br"\b", b"abc", re.LOCALE))
self.assertTrue(re.match(r"\b", "ьюя"))
self.assertIsNone(re.match(r"\b", "ьюя", re.ASCII))
# There's a word boundary at the end of a string.
self.assertTrue(re.fullmatch(r".+\b", "abc"))
self.assertTrue(re.fullmatch(r".+\b", "abc", re.ASCII))
self.assertTrue(re.fullmatch(br".+\b", b"abc"))
self.assertTrue(re.fullmatch(br".+\b", b"abc", re.LOCALE))
self.assertTrue(re.fullmatch(r".+\b", "ьюя"))
self.assertIsNone(re.search(r"\b", "ьюя", re.ASCII))
# A non-empty string includes a non-boundary zero-length match.
self.assertEqual(re.search(r"\B", "abc").span(), (1, 1))
self.assertEqual(re.search(r"\B", "abc", re.ASCII).span(), (1, 1))
self.assertEqual(re.search(br"\B", b"abc").span(), (1, 1))
self.assertEqual(re.search(br"\B", b"abc", re.LOCALE).span(), (1, 1))
self.assertEqual(re.search(r"\B", "ьюя").span(), (1, 1))
self.assertEqual(re.search(r"\B", "ьюя", re.ASCII).span(), (0, 0))
# There is no non-boundary match at the start of a string.
self.assertIsNone(re.match(r"\B", "abc"))
self.assertIsNone(re.match(r"\B", "abc", re.ASCII))
self.assertIsNone(re.match(br"\B", b"abc"))
self.assertIsNone(re.match(br"\B", b"abc", re.LOCALE))
self.assertIsNone(re.match(r"\B", "ьюя"))
self.assertTrue(re.match(r"\B", "ьюя", re.ASCII))
# There is no non-boundary match at the end of a string.
self.assertIsNone(re.fullmatch(r".+\B", "abc"))
self.assertIsNone(re.fullmatch(r".+\B", "abc", re.ASCII))
self.assertIsNone(re.fullmatch(br".+\B", b"abc"))
self.assertIsNone(re.fullmatch(br".+\B", b"abc", re.LOCALE))
self.assertIsNone(re.fullmatch(r".+\B", "ьюя"))
self.assertTrue(re.fullmatch(r".+\B", "ьюя", re.ASCII))
# However, an empty string contains no word boundaries, and also no
# non-boundaries.
self.assertIsNone(re.search(r"\b", ""))
self.assertIsNone(re.search(r"\b", "", re.ASCII))
self.assertIsNone(re.search(br"\b", b""))
self.assertIsNone(re.search(br"\b", b"", re.LOCALE))
# This one is questionable and different from the perlre behaviour,
# but describes current behavior.
self.assertIsNone(re.search(r"\B", ""))
self.assertIsNone(re.search(r"\B", "", re.ASCII))
self.assertIsNone(re.search(br"\B", b""))
self.assertIsNone(re.search(br"\B", b"", re.LOCALE))
# A single word-character string has two boundaries, but no
# non-boundary gaps.
self.assertEqual(len(re.findall(r"\b", "a")), 2)
self.assertEqual(len(re.findall(r"\b", "a", re.ASCII)), 2)
self.assertEqual(len(re.findall(br"\b", b"a")), 2)
self.assertEqual(len(re.findall(br"\b", b"a", re.LOCALE)), 2)
self.assertEqual(len(re.findall(r"\B", "a")), 0)