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cpython/Lib/test/test_re.py

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from test.support import verbose, run_unittest, gc_collect, bigmemtest, _2G, \
cpython_only, captured_stdout
import io
import locale
import re
import sre_compile
import string
import sys
import traceback
import unittest
import warnings
from re import Scanner
from weakref import proxy
# 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.error) 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.error) 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_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 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')
self.assertEqual(re.sub(r'\d+', self.bump_num, '08.2 -2 23x99y', 3),
'9.3 -3 23x99y')
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('(.)', re.escape(s), '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('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.error):
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')
self.assertEqual(re.sub('a', 'b', 'aaaaa', 1), 'baaaa')
self.assertEqual(re.sub('a', 'b', 'aaaaa', count=1), 'baaaa')
def test_bug_114660(self):
self.assertEqual(re.sub(r'(\S)\s+(\S)', r'\1 \2', 'hello there'),
'hello there')
def test_bug_462270(self):
# Test for empty sub() behaviour, see SF bug #462270
self.assertEqual(re.sub('x*', '-', 'abxd'), '-a-b-d-')
self.assertEqual(re.sub('x+', '-', 'abxd'), 'ab-d')
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)')
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)
# New valid/invalid identifiers in Python 3
re.compile('(?P<µ>x)(?P=µ)(?(µ)y)')
re.compile('(?P<𝔘𝔫𝔦𝔠𝔬𝔡𝔢>x)(?P=𝔘𝔫𝔦𝔠𝔬𝔡𝔢)(?(𝔘𝔫𝔦𝔠𝔬𝔡𝔢)y)')
self.checkPatternError('(?P<©>x)', "bad character in group name '©'", 4)
# 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_refs(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.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.checkTemplateError('(?P<a>x)', r'\g<-1>', 'xx',
"bad character in group name '-1'", 3)
# New valid/invalid 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')
self.checkTemplateError('(?P<a>x)', r'\g<©>', 'xx',
"bad character in group name '©'", 3)
# 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_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))
self.assertEqual(re.subn("b*", "x", "xyz", 2), ('xxxyz', 2))
self.assertEqual(re.subn("b*", "x", "xyz", count=2), ('xxxyz', 2))
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']),
('(:)*', ['', ':', 'a', ':', 'b', ':', 'c']),
]:
with self.subTest(sep=sep), self.assertWarns(FutureWarning):
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.assertRaises(ValueError):
self.assertTypedEqual(re.split(sep, ':a:b::c'), expected)
def test_qualified_re_split(self):
self.assertEqual(re.split(":", ":a:b::c", 2), ['', 'a', 'b::c'])
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'])
with self.assertWarns(FutureWarning):
self.assertEqual(re.split("(:*)", ":a:b::c", maxsplit=2),
['', ':', 'a', ':', 'b::c'])
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(KeyError, 'a2'):
'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))$', 'a').groups(),
('a', ''))
# Tests for bug #1177831: exercise groups other than the first group
p = re.compile('(?P<g1>a)(?P<g2>b)?((?(g2)c|d))')
self.assertEqual(p.match('abc').groups(),
('a', 'b', 'c'))
self.assertEqual(p.match('ad').groups(),
('a', None, 'd'))
self.assertIsNone(p.match('abd'))
self.assertIsNone(p.match('ac'))
# Support > 100 groups.
pat = '|'.join('x(?P<a%d>%x)y' % (i, i) for i in range(1, 200 + 1))
pat = '(?:%s)(?(200)z)' % pat
self.assertEqual(re.match(pat, 'xc8yz').span(), (0, 5))
self.checkPatternError(r'(?P<a>)(?(0))', 'bad group number', 10)
self.checkPatternError(r'()(?(1)a|b',
'missing ), unterminated subpattern', 2)
self.checkPatternError(r'()(?(1)a|b|c)',
'conditional backref with more than '
'two branches', 10)
def test_re_groupref_overflow(self):
from sre_constants import MAXGROUPS
self.checkTemplateError('()', r'\g<%s>' % MAXGROUPS, 'xx',
'invalid group reference %d' % MAXGROUPS, 3)
self.checkPatternError(r'(?P<a>)(?(%d))' % MAXGROUPS,
'invalid group reference %d' % MAXGROUPS, 10)
def test_re_groupref(self):
self.assertEqual(re.match(r'^(\|)?([^()]+)\1$', '|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.error, re.compile, '\\%c' % c)
for c in 'ceghijklmopqyzABCEFGHIJKLMNOPQRTVXYZ':
with self.subTest(c):
self.assertRaises(re.error, re.compile, '[\\%c]' % c)
def test_string_boundaries(self):
# See http://bugs.python.org/issue10713
self.assertEqual(re.search(r"\b(abc)\b", "abc").group(1),
"abc")
# There's a word boundary at the start of a string.
self.assertTrue(re.match(r"\b", "abc"))
# A non-empty string includes a non-boundary zero-length match.
self.assertTrue(re.search(r"\B", "abc"))
# There is no non-boundary match at the start of a string.
self.assertFalse(re.match(r"\B", "abc"))
# However, an empty string contains no word boundaries, and also no
# non-boundaries.
self.assertIsNone(re.search(r"\B", ""))
# This one is questionable and different from the perlre behaviour,
# but describes current behavior.
self.assertIsNone(re.search(r"\b", ""))
# 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")), 0)
# If there are no words, there are no boundaries
self.assertEqual(len(re.findall(r"\b", " ")), 0)
self.assertEqual(len(re.findall(r"\b", " ")), 0)
# Can match around the whitespace.
self.assertEqual(len(re.findall(r"\B", " ")), 2)
def test_bigcharset(self):
self.assertEqual(re.match("([\u2222\u2223])",
"\u2222").group(1), "\u2222")
r = '[%s]' % ''.join(map(chr, range(256, 2**16, 255)))
self.assertEqual(re.match(r, "\uff01").group(), "\uff01")
def test_big_codesize(self):
# Issue #1160
r = re.compile('|'.join(('%d'%x for x in range(10000))))
self.assertTrue(r.match('1000'))
self.assertTrue(r.match('9999'))
def test_anyall(self):
self.assertEqual(re.match("a.b", "a\nb", re.DOTALL).group(0),
"a\nb")
self.assertEqual(re.match("a.*b", "a\n\nb", re.DOTALL).group(0),
"a\n\nb")
def test_lookahead(self):
self.assertEqual(re.match(r"(a(?=\s[^a]))", "a b").group(1), "a")
self.assertEqual(re.match(r"(a(?=\s[^a]*))", "a b").group(1), "a")
self.assertEqual(re.match(r"(a(?=\s[abc]))", "a b").group(1), "a")
self.assertEqual(re.match(r"(a(?=\s[abc]*))", "a bc").group(1), "a")
self.assertEqual(re.match(r"(a)(?=\s\1)", "a a").group(1), "a")
self.assertEqual(re.match(r"(a)(?=\s\1*)", "a aa").group(1), "a")
self.assertEqual(re.match(r"(a)(?=\s(abc|a))", "a a").group(1), "a")
self.assertEqual(re.match(r"(a(?!\s[^a]))", "a a").group(1), "a")
self.assertEqual(re.match(r"(a(?!\s[abc]))", "a d").group(1), "a")
self.assertEqual(re.match(r"(a)(?!\s\1)", "a b").group(1), "a")
self.assertEqual(re.match(r"(a)(?!\s(abc|a))", "a b").group(1), "a")
# Group reference.
self.assertTrue(re.match(r'(a)b(?=\1)a', 'aba'))
self.assertIsNone(re.match(r'(a)b(?=\1)c', 'abac'))
# Conditional group reference.
self.assertTrue(re.match(r'(?:(a)|(x))b(?=(?(2)x|c))c', 'abc'))
self.assertIsNone(re.match(r'(?:(a)|(x))b(?=(?(2)c|x))c', 'abc'))
self.assertTrue(re.match(r'(?:(a)|(x))b(?=(?(2)x|c))c', 'abc'))
self.assertIsNone(re.match(r'(?:(a)|(x))b(?=(?(1)b|x))c', 'abc'))
self.assertTrue(re.match(r'(?:(a)|(x))b(?=(?(1)c|x))c', 'abc'))
# Group used before defined.
self.assertTrue(re.match(r'(a)b(?=(?(2)x|c))(c)', 'abc'))
self.assertIsNone(re.match(r'(a)b(?=(?(2)b|x))(c)', 'abc'))
self.assertTrue(re.match(r'(a)b(?=(?(1)c|x))(c)', 'abc'))
def test_lookbehind(self):
self.assertTrue(re.match(r'ab(?<=b)c', 'abc'))
self.assertIsNone(re.match(r'ab(?<=c)c', 'abc'))
self.assertIsNone(re.match(r'ab(?<!b)c', 'abc'))
self.assertTrue(re.match(r'ab(?<!c)c', 'abc'))
# Group reference.
self.assertTrue(re.match(r'(a)a(?<=\1)c', 'aac'))
self.assertIsNone(re.match(r'(a)b(?<=\1)a', 'abaa'))
self.assertIsNone(re.match(r'(a)a(?<!\1)c', 'aac'))
self.assertTrue(re.match(r'(a)b(?<!\1)a', 'abaa'))
# Conditional group reference.
self.assertIsNone(re.match(r'(?:(a)|(x))b(?<=(?(2)x|c))c', 'abc'))
self.assertIsNone(re.match(r'(?:(a)|(x))b(?<=(?(2)b|x))c', 'abc'))
self.assertTrue(re.match(r'(?:(a)|(x))b(?<=(?(2)x|b))c', 'abc'))
self.assertIsNone(re.match(r'(?:(a)|(x))b(?<=(?(1)c|x))c', 'abc'))
self.assertTrue(re.match(r'(?:(a)|(x))b(?<=(?(1)b|x))c', 'abc'))
# Group used before defined.
self.assertRaises(re.error, re.compile, r'(a)b(?<=(?(2)b|x))(c)')
self.assertIsNone(re.match(r'(a)b(?<=(?(1)c|x))(c)', 'abc'))
self.assertTrue(re.match(r'(a)b(?<=(?(1)b|x))(c)', 'abc'))
# Group defined in the same lookbehind pattern
self.assertRaises(re.error, re.compile, r'(a)b(?<=(.)\2)(c)')
self.assertRaises(re.error, re.compile, r'(a)b(?<=(?P<a>.)(?P=a))(c)')
self.assertRaises(re.error, re.compile, r'(a)b(?<=(a)(?(2)b|x))(c)')
self.assertRaises(re.error, re.compile, r'(a)b(?<=(.)(?<=\2))(c)')
def test_ignore_case(self):
self.assertEqual(re.match("abc", "ABC", re.I).group(0), "ABC")
self.assertEqual(re.match(b"abc", b"ABC", re.I).group(0), b"ABC")
self.assertEqual(re.match(r"(a\s[^a])", "a b", re.I).group(1), "a b")
self.assertEqual(re.match(r"(a\s[^a]*)", "a bb", re.I).group(1), "a bb")
self.assertEqual(re.match(r"(a\s[abc])", "a b", re.I).group(1), "a b")
self.assertEqual(re.match(r"(a\s[abc]*)", "a bb", re.I).group(1), "a bb")
self.assertEqual(re.match(r"((a)\s\2)", "a a", re.I).group(1), "a a")
self.assertEqual(re.match(r"((a)\s\2*)", "a aa", re.I).group(1), "a aa")
self.assertEqual(re.match(r"((a)\s(abc|a))", "a a", re.I).group(1), "a a")
self.assertEqual(re.match(r"((a)\s(abc|a)*)", "a aa", re.I).group(1), "a aa")
assert '\u212a'.lower() == 'k' # 'K'
self.assertTrue(re.match(r'K', '\u212a', re.I))
self.assertTrue(re.match(r'k', '\u212a', re.I))
self.assertTrue(re.match(r'\u212a', 'K', re.I))
self.assertTrue(re.match(r'\u212a', 'k', re.I))
assert '\u017f'.upper() == 'S' # 'ſ'
self.assertTrue(re.match(r'S', '\u017f', re.I))
self.assertTrue(re.match(r's', '\u017f', re.I))
self.assertTrue(re.match(r'\u017f', 'S', re.I))
self.assertTrue(re.match(r'\u017f', 's', re.I))
assert '\ufb05'.upper() == '\ufb06'.upper() == 'ST' # 'ſt', 'st'
self.assertTrue(re.match(r'\ufb05', '\ufb06', re.I))
self.assertTrue(re.match(r'\ufb06', '\ufb05', re.I))
def test_ignore_case_set(self):
self.assertTrue(re.match(r'[19A]', 'A', re.I))
self.assertTrue(re.match(r'[19a]', 'a', re.I))
self.assertTrue(re.match(r'[19a]', 'A', re.I))
self.assertTrue(re.match(r'[19A]', 'a', re.I))
self.assertTrue(re.match(br'[19A]', b'A', re.I))
self.assertTrue(re.match(br'[19a]', b'a', re.I))
self.assertTrue(re.match(br'[19a]', b'A', re.I))
self.assertTrue(re.match(br'[19A]', b'a', re.I))
assert '\u212a'.lower() == 'k' # 'K'
self.assertTrue(re.match(r'[19K]', '\u212a', re.I))
self.assertTrue(re.match(r'[19k]', '\u212a', re.I))
self.assertTrue(re.match(r'[19\u212a]', 'K', re.I))
self.assertTrue(re.match(r'[19\u212a]', 'k', re.I))
assert '\u017f'.upper() == 'S' # 'ſ'
self.assertTrue(re.match(r'[19S]', '\u017f', re.I))
self.assertTrue(re.match(r'[19s]', '\u017f', re.I))
self.assertTrue(re.match(r'[19\u017f]', 'S', re.I))
self.assertTrue(re.match(r'[19\u017f]', 's', re.I))
assert '\ufb05'.upper() == '\ufb06'.upper() == 'ST' # 'ſt', 'st'
self.assertTrue(re.match(r'[19\ufb05]', '\ufb06', re.I))
self.assertTrue(re.match(r'[19\ufb06]', '\ufb05', re.I))
def test_ignore_case_range(self):
# Issues #3511, #17381.
self.assertTrue(re.match(r'[9-a]', '_', re.I))
self.assertIsNone(re.match(r'[9-A]', '_', re.I))
self.assertTrue(re.match(br'[9-a]', b'_', re.I))
self.assertIsNone(re.match(br'[9-A]', b'_', re.I))
self.assertTrue(re.match(r'[\xc0-\xde]', '\xd7', re.I))
self.assertIsNone(re.match(r'[\xc0-\xde]', '\xf7', re.I))
self.assertTrue(re.match(r'[\xe0-\xfe]', '\xf7', re.I))
self.assertIsNone(re.match(r'[\xe0-\xfe]', '\xd7', re.I))
self.assertTrue(re.match(r'[\u0430-\u045f]', '\u0450', re.I))
self.assertTrue(re.match(r'[\u0430-\u045f]', '\u0400', re.I))
self.assertTrue(re.match(r'[\u0400-\u042f]', '\u0450', re.I))
self.assertTrue(re.match(r'[\u0400-\u042f]', '\u0400', re.I))
self.assertTrue(re.match(r'[\U00010428-\U0001044f]', '\U00010428', re.I))
self.assertTrue(re.match(r'[\U00010428-\U0001044f]', '\U00010400', re.I))
self.assertTrue(re.match(r'[\U00010400-\U00010427]', '\U00010428', re.I))
self.assertTrue(re.match(r'[\U00010400-\U00010427]', '\U00010400', re.I))
assert '\u212a'.lower() == 'k' # 'K'
self.assertTrue(re.match(r'[J-M]', '\u212a', re.I))
self.assertTrue(re.match(r'[j-m]', '\u212a', re.I))
self.assertTrue(re.match(r'[\u2129-\u212b]', 'K', re.I))
self.assertTrue(re.match(r'[\u2129-\u212b]', 'k', re.I))
assert '\u017f'.upper() == 'S' # 'ſ'
self.assertTrue(re.match(r'[R-T]', '\u017f', re.I))
self.assertTrue(re.match(r'[r-t]', '\u017f', re.I))
self.assertTrue(re.match(r'[\u017e-\u0180]', 'S', re.I))
self.assertTrue(re.match(r'[\u017e-\u0180]', 's', re.I))
assert '\ufb05'.upper() == '\ufb06'.upper() == 'ST' # 'ſt', 'st'
self.assertTrue(re.match(r'[\ufb04-\ufb05]', '\ufb06', re.I))
self.assertTrue(re.match(r'[\ufb06-\ufb07]', '\ufb05', re.I))
def test_category(self):
self.assertEqual(re.match(r"(\s)", " ").group(1), " ")
def test_getlower(self):
import _sre
self.assertEqual(_sre.getlower(ord('A'), 0), ord('a'))
self.assertEqual(_sre.getlower(ord('A'), re.LOCALE), ord('a'))
self.assertEqual(_sre.getlower(ord('A'), re.UNICODE), ord('a'))
self.assertEqual(_sre.getlower(ord('A'), re.ASCII), ord('a'))
self.assertEqual(re.match("abc", "ABC", re.I).group(0), "ABC")
self.assertEqual(re.match(b"abc", b"ABC", re.I).group(0), b"ABC")
self.assertEqual(re.match("abc", "ABC", re.I|re.A).group(0), "ABC")
self.assertEqual(re.match(b"abc", b"ABC", re.I|re.L).group(0), b"ABC")
def test_not_literal(self):
self.assertEqual(re.search(r"\s([^a])", " b").group(1), "b")
self.assertEqual(re.search(r"\s([^a]*)", " bb").group(1), "bb")
def test_search_coverage(self):
self.assertEqual(re.search(r"\s(b)", " b").group(1), "b")
self.assertEqual(re.search(r"a\s", "a ").group(0), "a ")
def assertMatch(self, pattern, text, match=None, span=None,
matcher=re.match):
if match is None and span is None:
# the pattern matches the whole text
match = text
span = (0, len(text))
elif match is None or span is None:
raise ValueError('If match is not None, span should be specified '
'(and vice versa).')
m = matcher(pattern, text)
self.assertTrue(m)
self.assertEqual(m.group(), match)
self.assertEqual(m.span(), span)
def test_re_escape(self):
alnum_chars = string.ascii_letters + string.digits + '_'
p = ''.join(chr(i) for i in range(256))
for c in p:
if c in alnum_chars:
self.assertEqual(re.escape(c), c)
elif c == '\x00':
self.assertEqual(re.escape(c), '\\000')
else:
self.assertEqual(re.escape(c), '\\' + c)
self.assertMatch(re.escape(c), c)
self.assertMatch(re.escape(p), p)
def test_re_escape_byte(self):
alnum_chars = (string.ascii_letters + string.digits + '_').encode('ascii')
p = bytes(range(256))
for i in p:
b = bytes([i])
if b in alnum_chars:
self.assertEqual(re.escape(b), b)
elif i == 0:
self.assertEqual(re.escape(b), b'\\000')
else:
self.assertEqual(re.escape(b), b'\\' + b)
self.assertMatch(re.escape(b), b)
self.assertMatch(re.escape(p), p)
def test_re_escape_non_ascii(self):
s = 'xxx\u2620\u2620\u2620xxx'
s_escaped = re.escape(s)
self.assertEqual(s_escaped, 'xxx\\\u2620\\\u2620\\\u2620xxx')
self.assertMatch(s_escaped, s)
self.assertMatch('.%s+.' % re.escape('\u2620'), s,
'x\u2620\u2620\u2620x', (2, 7), re.search)
def test_re_escape_non_ascii_bytes(self):
b = 'y\u2620y\u2620y'.encode('utf-8')
b_escaped = re.escape(b)
self.assertEqual(b_escaped, b'y\\\xe2\\\x98\\\xa0y\\\xe2\\\x98\\\xa0y')
self.assertMatch(b_escaped, b)
res = re.findall(re.escape('\u2620'.encode('utf-8')), b)
self.assertEqual(len(res), 2)
def test_pickling(self):
import pickle
oldpat = re.compile('a(?:b|(c|e){1,2}?|d)+?(.)', re.UNICODE)
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
pickled = pickle.dumps(oldpat, proto)
newpat = pickle.loads(pickled)
self.assertEqual(newpat, oldpat)
# current pickle expects the _compile() reconstructor in re module
from re import _compile
def test_constants(self):
self.assertEqual(re.I, re.IGNORECASE)
self.assertEqual(re.L, re.LOCALE)
self.assertEqual(re.M, re.MULTILINE)
self.assertEqual(re.S, re.DOTALL)
self.assertEqual(re.X, re.VERBOSE)
def test_flags(self):
for flag in [re.I, re.M, re.X, re.S, re.A, re.U]:
self.assertTrue(re.compile('^pattern$', flag))
for flag in [re.I, re.M, re.X, re.S, re.A, re.L]:
self.assertTrue(re.compile(b'^pattern$', flag))
def test_sre_character_literals(self):
for i in [0, 8, 16, 32, 64, 127, 128, 255, 256, 0xFFFF, 0x10000, 0x10FFFF]:
if i < 256:
self.assertTrue(re.match(r"\%03o" % i, chr(i)))
self.assertTrue(re.match(r"\%03o0" % i, chr(i)+"0"))
self.assertTrue(re.match(r"\%03o8" % i, chr(i)+"8"))
self.assertTrue(re.match(r"\x%02x" % i, chr(i)))
self.assertTrue(re.match(r"\x%02x0" % i, chr(i)+"0"))
self.assertTrue(re.match(r"\x%02xz" % i, chr(i)+"z"))
if i < 0x10000:
self.assertTrue(re.match(r"\u%04x" % i, chr(i)))
self.assertTrue(re.match(r"\u%04x0" % i, chr(i)+"0"))
self.assertTrue(re.match(r"\u%04xz" % i, chr(i)+"z"))
self.assertTrue(re.match(r"\U%08x" % i, chr(i)))
self.assertTrue(re.match(r"\U%08x0" % i, chr(i)+"0"))
self.assertTrue(re.match(r"\U%08xz" % i, chr(i)+"z"))
self.assertTrue(re.match(r"\0", "\000"))
self.assertTrue(re.match(r"\08", "\0008"))
self.assertTrue(re.match(r"\01", "\001"))
self.assertTrue(re.match(r"\018", "\0018"))
self.checkPatternError(r"\567",
r'octal escape value \567 outside of '
r'range 0-0o377', 0)
self.checkPatternError(r"\911", 'invalid group reference 91', 1)
self.checkPatternError(r"\x1", r'incomplete escape \x1', 0)
self.checkPatternError(r"\x1z", r'incomplete escape \x1', 0)
self.checkPatternError(r"\u123", r'incomplete escape \u123', 0)
self.checkPatternError(r"\u123z", r'incomplete escape \u123', 0)
self.checkPatternError(r"\U0001234", r'incomplete escape \U0001234', 0)
self.checkPatternError(r"\U0001234z", r'incomplete escape \U0001234', 0)
self.checkPatternError(r"\U00110000", r'bad escape \U00110000', 0)
def test_sre_character_class_literals(self):
for i in [0, 8, 16, 32, 64, 127, 128, 255, 256, 0xFFFF, 0x10000, 0x10FFFF]:
if i < 256:
self.assertTrue(re.match(r"[\%o]" % i, chr(i)))
self.assertTrue(re.match(r"[\%o8]" % i, chr(i)))
self.assertTrue(re.match(r"[\%03o]" % i, chr(i)))
self.assertTrue(re.match(r"[\%03o0]" % i, chr(i)))
self.assertTrue(re.match(r"[\%03o8]" % i, chr(i)))
self.assertTrue(re.match(r"[\x%02x]" % i, chr(i)))
self.assertTrue(re.match(r"[\x%02x0]" % i, chr(i)))
self.assertTrue(re.match(r"[\x%02xz]" % i, chr(i)))
if i < 0x10000:
self.assertTrue(re.match(r"[\u%04x]" % i, chr(i)))
self.assertTrue(re.match(r"[\u%04x0]" % i, chr(i)))
self.assertTrue(re.match(r"[\u%04xz]" % i, chr(i)))
self.assertTrue(re.match(r"[\U%08x]" % i, chr(i)))
self.assertTrue(re.match(r"[\U%08x0]" % i, chr(i)+"0"))
self.assertTrue(re.match(r"[\U%08xz]" % i, chr(i)+"z"))
self.checkPatternError(r"[\567]",
r'octal escape value \567 outside of '
r'range 0-0o377', 1)
self.checkPatternError(r"[\911]", r'bad escape \9', 1)
self.checkPatternError(r"[\x1z]", r'incomplete escape \x1', 1)
self.checkPatternError(r"[\u123z]", r'incomplete escape \u123', 1)
self.checkPatternError(r"[\U0001234z]", r'incomplete escape \U0001234', 1)
self.checkPatternError(r"[\U00110000]", r'bad escape \U00110000', 1)
self.assertTrue(re.match(r"[\U0001d49c-\U0001d4b5]", "\U0001d49e"))
def test_sre_byte_literals(self):
for i in [0, 8, 16, 32, 64, 127, 128, 255]:
self.assertTrue(re.match((r"\%03o" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"\%03o0" % i).encode(), bytes([i])+b"0"))
self.assertTrue(re.match((r"\%03o8" % i).encode(), bytes([i])+b"8"))
self.assertTrue(re.match((r"\x%02x" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"\x%02x0" % i).encode(), bytes([i])+b"0"))
self.assertTrue(re.match((r"\x%02xz" % i).encode(), bytes([i])+b"z"))
self.assertRaises(re.error, re.compile, br"\u1234")
self.assertRaises(re.error, re.compile, br"\U00012345")
self.assertTrue(re.match(br"\0", b"\000"))
self.assertTrue(re.match(br"\08", b"\0008"))
self.assertTrue(re.match(br"\01", b"\001"))
self.assertTrue(re.match(br"\018", b"\0018"))
self.checkPatternError(br"\567",
r'octal escape value \567 outside of '
r'range 0-0o377', 0)
self.checkPatternError(br"\911", 'invalid group reference 91', 1)
self.checkPatternError(br"\x1", r'incomplete escape \x1', 0)
self.checkPatternError(br"\x1z", r'incomplete escape \x1', 0)
def test_sre_byte_class_literals(self):
for i in [0, 8, 16, 32, 64, 127, 128, 255]:
self.assertTrue(re.match((r"[\%o]" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"[\%o8]" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"[\%03o]" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"[\%03o0]" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"[\%03o8]" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"[\x%02x]" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"[\x%02x0]" % i).encode(), bytes([i])))
self.assertTrue(re.match((r"[\x%02xz]" % i).encode(), bytes([i])))
self.assertRaises(re.error, re.compile, br"[\u1234]")
self.assertRaises(re.error, re.compile, br"[\U00012345]")
self.checkPatternError(br"[\567]",
r'octal escape value \567 outside of '
r'range 0-0o377', 1)
self.checkPatternError(br"[\911]", r'bad escape \9', 1)
self.checkPatternError(br"[\x1z]", r'incomplete escape \x1', 1)
def test_character_set_errors(self):
self.checkPatternError(r'[', 'unterminated character set', 0)
self.checkPatternError(r'[^', 'unterminated character set', 0)
self.checkPatternError(r'[a', 'unterminated character set', 0)
# bug 545855 -- This pattern failed to cause a compile error as it
# should, instead provoking a TypeError.
self.checkPatternError(r"[a-", 'unterminated character set', 0)
self.checkPatternError(r"[\w-b]", r'bad character range \w-b', 1)
self.checkPatternError(r"[a-\w]", r'bad character range a-\w', 1)
self.checkPatternError(r"[b-a]", 'bad character range b-a', 1)
def test_bug_113254(self):
self.assertEqual(re.match(r'(a)|(b)', 'b').start(1), -1)
self.assertEqual(re.match(r'(a)|(b)', 'b').end(1), -1)
self.assertEqual(re.match(r'(a)|(b)', 'b').span(1), (-1, -1))
def test_bug_527371(self):
# bug described in patches 527371/672491
self.assertIsNone(re.match(r'(a)?a','a').lastindex)
self.assertEqual(re.match(r'(a)(b)?b','ab').lastindex, 1)
self.assertEqual(re.match(r'(?P<a>a)(?P<b>b)?b','ab').lastgroup, 'a')
self.assertEqual(re.match(r"(?P<a>a(b))", "ab").lastgroup, 'a')
self.assertEqual(re.match(r"((a))", "a").lastindex, 1)
def test_bug_418626(self):
# bugs 418626 at al. -- Testing Greg Chapman's addition of op code
# SRE_OP_MIN_REPEAT_ONE for eliminating recursion on simple uses of
# pattern '*?' on a long string.
self.assertEqual(re.match('.*?c', 10000*'ab'+'cd').end(0), 20001)
self.assertEqual(re.match('.*?cd', 5000*'ab'+'c'+5000*'ab'+'cde').end(0),
20003)
self.assertEqual(re.match('.*?cd', 20000*'abc'+'de').end(0), 60001)
# non-simple '*?' still used to hit the recursion limit, before the
# non-recursive scheme was implemented.
self.assertEqual(re.search('(a|b)*?c', 10000*'ab'+'cd').end(0), 20001)
def test_bug_612074(self):
pat="["+re.escape("\u2039")+"]"
self.assertEqual(re.compile(pat) and 1, 1)
def test_stack_overflow(self):
# nasty cases that used to overflow the straightforward recursive
# implementation of repeated groups.
self.assertEqual(re.match('(x)*', 50000*'x').group(1), 'x')
self.assertEqual(re.match('(x)*y', 50000*'x'+'y').group(1), 'x')
self.assertEqual(re.match('(x)*?y', 50000*'x'+'y').group(1), 'x')
def test_nothing_to_repeat(self):
for reps in '*', '+', '?', '{1,2}':
for mod in '', '?':
self.checkPatternError('%s%s' % (reps, mod),
'nothing to repeat', 0)
self.checkPatternError('(?:%s%s)' % (reps, mod),
'nothing to repeat', 3)
def test_multiple_repeat(self):
for outer_reps in '*', '+', '{1,2}':
for outer_mod in '', '?':
outer_op = outer_reps + outer_mod
for inner_reps in '*', '+', '?', '{1,2}':
for inner_mod in '', '?':
inner_op = inner_reps + inner_mod
self.checkPatternError(r'x%s%s' % (inner_op, outer_op),
'multiple repeat', 1 + len(inner_op))
def test_unlimited_zero_width_repeat(self):
# Issue #9669
self.assertIsNone(re.match(r'(?:a?)*y', 'z'))
self.assertIsNone(re.match(r'(?:a?)+y', 'z'))
self.assertIsNone(re.match(r'(?:a?){2,}y', 'z'))
self.assertIsNone(re.match(r'(?:a?)*?y', 'z'))
self.assertIsNone(re.match(r'(?:a?)+?y', 'z'))
self.assertIsNone(re.match(r'(?:a?){2,}?y', 'z'))
def test_scanner(self):
def s_ident(scanner, token): return token
def s_operator(scanner, token): return "op%s" % token
def s_float(scanner, token): return float(token)
def s_int(scanner, token): return int(token)
scanner = Scanner([
(r"[a-zA-Z_]\w*", s_ident),
(r"\d+\.\d*", s_float),
(r"\d+", s_int),
(r"=|\+|-|\*|/", s_operator),
(r"\s+", None),
])
self.assertTrue(scanner.scanner.scanner("").pattern)
self.assertEqual(scanner.scan("sum = 3*foo + 312.50 + bar"),
(['sum', 'op=', 3, 'op*', 'foo', 'op+', 312.5,
'op+', 'bar'], ''))
def test_bug_448951(self):
# bug 448951 (similar to 429357, but with single char match)
# (Also test greedy matches.)
for op in '','?','*':
self.assertEqual(re.match(r'((.%s):)?z'%op, 'z').groups(),
(None, None))
self.assertEqual(re.match(r'((.%s):)?z'%op, 'a:z').groups(),
('a:', 'a'))
def test_bug_725106(self):
# capturing groups in alternatives in repeats
self.assertEqual(re.match('^((a)|b)*', 'abc').groups(),
('b', 'a'))
self.assertEqual(re.match('^(([ab])|c)*', 'abc').groups(),
('c', 'b'))
self.assertEqual(re.match('^((d)|[ab])*', 'abc').groups(),
('b', None))
self.assertEqual(re.match('^((a)c|[ab])*', 'abc').groups(),
('b', None))
self.assertEqual(re.match('^((a)|b)*?c', 'abc').groups(),
('b', 'a'))
self.assertEqual(re.match('^(([ab])|c)*?d', 'abcd').groups(),
('c', 'b'))
self.assertEqual(re.match('^((d)|[ab])*?c', 'abc').groups(),
('b', None))
self.assertEqual(re.match('^((a)c|[ab])*?c', 'abc').groups(),
('b', None))
def test_bug_725149(self):
# mark_stack_base restoring before restoring marks
self.assertEqual(re.match('(a)(?:(?=(b)*)c)*', 'abb').groups(),
('a', None))
self.assertEqual(re.match('(a)((?!(b)*))*', 'abb').groups(),
('a', None, None))
def test_bug_764548(self):
# bug 764548, re.compile() barfs on str/unicode subclasses
class my_unicode(str): pass
pat = re.compile(my_unicode("abc"))
self.assertIsNone(pat.match("xyz"))
def test_finditer(self):
iter = re.finditer(r":+", "a:b::c:::d")
self.assertEqual([item.group(0) for item in iter],
[":", "::", ":::"])
pat = re.compile(r":+")
iter = pat.finditer("a:b::c:::d", 1, 10)
self.assertEqual([item.group(0) for item in iter],
[":", "::", ":::"])
pat = re.compile(r":+")
iter = pat.finditer("a:b::c:::d", pos=1, endpos=10)
self.assertEqual([item.group(0) for item in iter],
[":", "::", ":::"])
pat = re.compile(r":+")
iter = pat.finditer("a:b::c:::d", endpos=10, pos=1)
self.assertEqual([item.group(0) for item in iter],
[":", "::", ":::"])
pat = re.compile(r":+")
iter = pat.finditer("a:b::c:::d", pos=3, endpos=8)
self.assertEqual([item.group(0) for item in iter],
["::", "::"])
def test_bug_926075(self):
self.assertIsNot(re.compile('bug_926075'),
re.compile(b'bug_926075'))
def test_bug_931848(self):
pattern = "[\u002E\u3002\uFF0E\uFF61]"
self.assertEqual(re.compile(pattern).split("a.b.c"),
['a','b','c'])
def test_bug_581080(self):
iter = re.finditer(r"\s", "a b")
self.assertEqual(next(iter).span(), (1,2))
self.assertRaises(StopIteration, next, iter)
scanner = re.compile(r"\s").scanner("a b")
self.assertEqual(scanner.search().span(), (1, 2))
self.assertIsNone(scanner.search())
def test_bug_817234(self):
iter = re.finditer(r".*", "asdf")
self.assertEqual(next(iter).span(), (0, 4))
self.assertEqual(next(iter).span(), (4, 4))
self.assertRaises(StopIteration, next, iter)
def test_bug_6561(self):
# '\d' should match characters in Unicode category 'Nd'
# (Number, Decimal Digit), but not those in 'Nl' (Number,
# Letter) or 'No' (Number, Other).
decimal_digits = [
'\u0037', # '\N{DIGIT SEVEN}', category 'Nd'
'\u0e58', # '\N{THAI DIGIT SIX}', category 'Nd'
'\uff10', # '\N{FULLWIDTH DIGIT ZERO}', category 'Nd'
]
for x in decimal_digits:
self.assertEqual(re.match(r'^\d$', x).group(0), x)
not_decimal_digits = [
'\u2165', # '\N{ROMAN NUMERAL SIX}', category 'Nl'
'\u3039', # '\N{HANGZHOU NUMERAL TWENTY}', category 'Nl'
'\u2082', # '\N{SUBSCRIPT TWO}', category 'No'
'\u32b4', # '\N{CIRCLED NUMBER THIRTY NINE}', category 'No'
]
for x in not_decimal_digits:
self.assertIsNone(re.match(r'^\d$', x))
def test_empty_array(self):
# SF buf 1647541
import array
for typecode in 'bBuhHiIlLfd':
a = array.array(typecode)
self.assertIsNone(re.compile(b"bla").match(a))
self.assertEqual(re.compile(b"").match(a).groups(), ())
def test_inline_flags(self):
# Bug #1700
upper_char = '\u1ea0' # Latin Capital Letter A with Dot Below
lower_char = '\u1ea1' # Latin Small Letter A with Dot Below
p = re.compile(upper_char, re.I | re.U)
q = p.match(lower_char)
self.assertTrue(q)
p = re.compile(lower_char, re.I | re.U)
q = p.match(upper_char)
self.assertTrue(q)
p = re.compile('(?i)' + upper_char, re.U)
q = p.match(lower_char)
self.assertTrue(q)
p = re.compile('(?i)' + lower_char, re.U)
q = p.match(upper_char)
self.assertTrue(q)
p = re.compile('(?iu)' + upper_char)
q = p.match(lower_char)
self.assertTrue(q)
p = re.compile('(?iu)' + lower_char)
q = p.match(upper_char)
self.assertTrue(q)
self.assertTrue(re.match('(?ixu) ' + upper_char, lower_char))
self.assertTrue(re.match('(?ixu) ' + lower_char, upper_char))
p = upper_char + '(?i)'
with self.assertWarns(DeprecationWarning) as warns:
self.assertTrue(re.match(p, lower_char))
self.assertEqual(
str(warns.warnings[0].message),
'Flags not at the start of the expression %s' % p
)
p = upper_char + '(?i)%s' % ('.?' * 100)
with self.assertWarns(DeprecationWarning) as warns:
self.assertTrue(re.match(p, lower_char))
self.assertEqual(
str(warns.warnings[0].message),
'Flags not at the start of the expression %s (truncated)' % p[:20]
)
def test_dollar_matches_twice(self):
"$ matches the end of string, and just before the terminating \n"
pattern = re.compile('$')
self.assertEqual(pattern.sub('#', 'a\nb\n'), 'a\nb#\n#')
self.assertEqual(pattern.sub('#', 'a\nb\nc'), 'a\nb\nc#')
self.assertEqual(pattern.sub('#', '\n'), '#\n#')
pattern = re.compile('$', re.MULTILINE)
self.assertEqual(pattern.sub('#', 'a\nb\n' ), 'a#\nb#\n#' )
self.assertEqual(pattern.sub('#', 'a\nb\nc'), 'a#\nb#\nc#')
self.assertEqual(pattern.sub('#', '\n'), '#\n#')
def test_bytes_str_mixing(self):
# Mixing str and bytes is disallowed
pat = re.compile('.')
bpat = re.compile(b'.')
self.assertRaises(TypeError, pat.match, b'b')
self.assertRaises(TypeError, bpat.match, 'b')
self.assertRaises(TypeError, pat.sub, b'b', 'c')
self.assertRaises(TypeError, pat.sub, 'b', b'c')
self.assertRaises(TypeError, pat.sub, b'b', b'c')
self.assertRaises(TypeError, bpat.sub, b'b', 'c')
self.assertRaises(TypeError, bpat.sub, 'b', b'c')
self.assertRaises(TypeError, bpat.sub, 'b', 'c')
def test_ascii_and_unicode_flag(self):
# String patterns
for flags in (0, re.UNICODE):
pat = re.compile('\xc0', flags | re.IGNORECASE)
self.assertTrue(pat.match('\xe0'))
pat = re.compile(r'\w', flags)
self.assertTrue(pat.match('\xe0'))
pat = re.compile('\xc0', re.ASCII | re.IGNORECASE)
self.assertIsNone(pat.match('\xe0'))
pat = re.compile('(?a)\xc0', re.IGNORECASE)
self.assertIsNone(pat.match('\xe0'))
pat = re.compile(r'\w', re.ASCII)
self.assertIsNone(pat.match('\xe0'))
pat = re.compile(r'(?a)\w')
self.assertIsNone(pat.match('\xe0'))
# Bytes patterns
for flags in (0, re.ASCII):
pat = re.compile(b'\xc0', flags | re.IGNORECASE)
self.assertIsNone(pat.match(b'\xe0'))
pat = re.compile(br'\w', flags)
self.assertIsNone(pat.match(b'\xe0'))
# Incompatibilities
self.assertRaises(ValueError, re.compile, br'\w', re.UNICODE)
self.assertRaises(ValueError, re.compile, br'(?u)\w')
self.assertRaises(ValueError, re.compile, r'\w', re.UNICODE | re.ASCII)
self.assertRaises(ValueError, re.compile, r'(?u)\w', re.ASCII)
self.assertRaises(ValueError, re.compile, r'(?a)\w', re.UNICODE)
self.assertRaises(ValueError, re.compile, r'(?au)\w')
def test_locale_flag(self):
import locale
_, enc = locale.getlocale(locale.LC_CTYPE)
# Search non-ASCII letter
for i in range(128, 256):
try:
c = bytes([i]).decode(enc)
sletter = c.lower()
if sletter == c: continue
bletter = sletter.encode(enc)
if len(bletter) != 1: continue
if bletter.decode(enc) != sletter: continue
bpat = re.escape(bytes([i]))
break
except (UnicodeError, TypeError):
pass
else:
bletter = None
bpat = b'A'
# Bytes patterns
pat = re.compile(bpat, re.LOCALE | re.IGNORECASE)
if bletter:
self.assertTrue(pat.match(bletter))
pat = re.compile(b'(?L)' + bpat, re.IGNORECASE)
if bletter:
self.assertTrue(pat.match(bletter))
pat = re.compile(bpat, re.IGNORECASE)
if bletter:
self.assertIsNone(pat.match(bletter))
pat = re.compile(br'\w', re.LOCALE)
if bletter:
self.assertTrue(pat.match(bletter))
pat = re.compile(br'(?L)\w')
if bletter:
self.assertTrue(pat.match(bletter))
pat = re.compile(br'\w')
if bletter:
self.assertIsNone(pat.match(bletter))
# Incompatibilities
self.assertRaises(ValueError, re.compile, '', re.LOCALE)
self.assertRaises(ValueError, re.compile, '(?L)')
self.assertRaises(ValueError, re.compile, b'', re.LOCALE | re.ASCII)
self.assertRaises(ValueError, re.compile, b'(?L)', re.ASCII)
self.assertRaises(ValueError, re.compile, b'(?a)', re.LOCALE)
self.assertRaises(ValueError, re.compile, b'(?aL)')
def test_scoped_flags(self):
self.assertTrue(re.match(r'(?i:a)b', 'Ab'))
self.assertIsNone(re.match(r'(?i:a)b', 'aB'))
self.assertIsNone(re.match(r'(?-i:a)b', 'Ab', re.IGNORECASE))
self.assertTrue(re.match(r'(?-i:a)b', 'aB', re.IGNORECASE))
self.assertIsNone(re.match(r'(?i:(?-i:a)b)', 'Ab'))
self.assertTrue(re.match(r'(?i:(?-i:a)b)', 'aB'))
self.assertTrue(re.match(r'(?x: a) b', 'a b'))
self.assertIsNone(re.match(r'(?x: a) b', ' a b'))
self.assertTrue(re.match(r'(?-x: a) b', ' ab', re.VERBOSE))
self.assertIsNone(re.match(r'(?-x: a) b', 'ab', re.VERBOSE))
self.checkPatternError(r'(?a:\w)',
'bad inline flags: cannot turn on global flag', 3)
self.checkPatternError(r'(?a)(?-a:\w)',
'bad inline flags: cannot turn off global flag', 8)
self.checkPatternError(r'(?i-i:a)',
'bad inline flags: flag turned on and off', 5)
self.checkPatternError(r'(?-', 'missing flag', 3)
self.checkPatternError(r'(?-+', 'missing flag', 3)
self.checkPatternError(r'(?-z', 'unknown flag', 3)
self.checkPatternError(r'(?-i', 'missing :', 4)
self.checkPatternError(r'(?-i)', 'missing :', 4)
self.checkPatternError(r'(?-i+', 'missing :', 4)
self.checkPatternError(r'(?-iz', 'unknown flag', 4)
self.checkPatternError(r'(?i:', 'missing ), unterminated subpattern', 0)
self.checkPatternError(r'(?i', 'missing -, : or )', 3)
self.checkPatternError(r'(?i+', 'missing -, : or )', 3)
self.checkPatternError(r'(?iz', 'unknown flag', 3)
def test_bug_6509(self):
# Replacement strings of both types must parse properly.
# all strings
pat = re.compile(r'a(\w)')
self.assertEqual(pat.sub('b\\1', 'ac'), 'bc')
pat = re.compile('a(.)')
self.assertEqual(pat.sub('b\\1', 'a\u1234'), 'b\u1234')
pat = re.compile('..')
self.assertEqual(pat.sub(lambda m: 'str', 'a5'), 'str')
# all bytes
pat = re.compile(br'a(\w)')
self.assertEqual(pat.sub(b'b\\1', b'ac'), b'bc')
pat = re.compile(b'a(.)')
self.assertEqual(pat.sub(b'b\\1', b'a\xCD'), b'b\xCD')
pat = re.compile(b'..')
self.assertEqual(pat.sub(lambda m: b'bytes', b'a5'), b'bytes')
def test_dealloc(self):
# issue 3299: check for segfault in debug build
import _sre
# the overflow limit is different on wide and narrow builds and it
# depends on the definition of SRE_CODE (see sre.h).
# 2**128 should be big enough to overflow on both. For smaller values
# a RuntimeError is raised instead of OverflowError.
long_overflow = 2**128
self.assertRaises(TypeError, re.finditer, "a", {})
with self.assertRaises(OverflowError):
_sre.compile("abc", 0, [long_overflow], 0, {}, ())
with self.assertRaises(TypeError):
_sre.compile({}, 0, [], 0, [], [])
def test_search_dot_unicode(self):
self.assertTrue(re.search("123.*-", '123abc-'))
self.assertTrue(re.search("123.*-", '123\xe9-'))
self.assertTrue(re.search("123.*-", '123\u20ac-'))
self.assertTrue(re.search("123.*-", '123\U0010ffff-'))
self.assertTrue(re.search("123.*-", '123\xe9\u20ac\U0010ffff-'))
def test_compile(self):
# Test return value when given string and pattern as parameter
pattern = re.compile('random pattern')
self.assertIsInstance(pattern, re._pattern_type)
same_pattern = re.compile(pattern)
self.assertIsInstance(same_pattern, re._pattern_type)
self.assertIs(same_pattern, pattern)
# Test behaviour when not given a string or pattern as parameter
self.assertRaises(TypeError, re.compile, 0)
@bigmemtest(size=_2G, memuse=1)
def test_large_search(self, size):
# Issue #10182: indices were 32-bit-truncated.
s = 'a' * size
m = re.search('$', s)
self.assertIsNotNone(m)
self.assertEqual(m.start(), size)
self.assertEqual(m.end(), size)
# The huge memuse is because of re.sub() using a list and a join()
# to create the replacement result.
@bigmemtest(size=_2G, memuse=16 + 2)
def test_large_subn(self, size):
# Issue #10182: indices were 32-bit-truncated.
s = 'a' * size
r, n = re.subn('', '', s)
self.assertEqual(r, s)
self.assertEqual(n, size + 1)
def test_bug_16688(self):
# Issue 16688: Backreferences make case-insensitive regex fail on
# non-ASCII strings.
self.assertEqual(re.findall(r"(?i)(a)\1", "aa \u0100"), ['a'])
self.assertEqual(re.match(r"(?s).{1,3}", "\u0100\u0100").span(), (0, 2))
def test_repeat_minmax_overflow(self):
# Issue #13169
string = "x" * 100000
self.assertEqual(re.match(r".{65535}", string).span(), (0, 65535))
self.assertEqual(re.match(r".{,65535}", string).span(), (0, 65535))
self.assertEqual(re.match(r".{65535,}?", string).span(), (0, 65535))
self.assertEqual(re.match(r".{65536}", string).span(), (0, 65536))
self.assertEqual(re.match(r".{,65536}", string).span(), (0, 65536))
self.assertEqual(re.match(r".{65536,}?", string).span(), (0, 65536))
# 2**128 should be big enough to overflow both SRE_CODE and Py_ssize_t.
self.assertRaises(OverflowError, re.compile, r".{%d}" % 2**128)
self.assertRaises(OverflowError, re.compile, r".{,%d}" % 2**128)
self.assertRaises(OverflowError, re.compile, r".{%d,}?" % 2**128)
self.assertRaises(OverflowError, re.compile, r".{%d,%d}" % (2**129, 2**128))
@cpython_only
def test_repeat_minmax_overflow_maxrepeat(self):
try:
from _sre import MAXREPEAT
except ImportError:
self.skipTest('requires _sre.MAXREPEAT constant')
string = "x" * 100000
self.assertIsNone(re.match(r".{%d}" % (MAXREPEAT - 1), string))
self.assertEqual(re.match(r".{,%d}" % (MAXREPEAT - 1), string).span(),
(0, 100000))
self.assertIsNone(re.match(r".{%d,}?" % (MAXREPEAT - 1), string))
self.assertRaises(OverflowError, re.compile, r".{%d}" % MAXREPEAT)
self.assertRaises(OverflowError, re.compile, r".{,%d}" % MAXREPEAT)
self.assertRaises(OverflowError, re.compile, r".{%d,}?" % MAXREPEAT)
def test_backref_group_name_in_exception(self):
# Issue 17341: Poor error message when compiling invalid regex
self.checkPatternError('(?P=<foo>)',
"bad character in group name '<foo>'", 4)
def test_group_name_in_exception(self):
# Issue 17341: Poor error message when compiling invalid regex
self.checkPatternError('(?P<?foo>)',
"bad character in group name '?foo'", 4)
def test_issue17998(self):
for reps in '*', '+', '?', '{1}':
for mod in '', '?':
pattern = '.' + reps + mod + 'yz'
self.assertEqual(re.compile(pattern, re.S).findall('xyz'),
['xyz'], msg=pattern)
pattern = pattern.encode()
self.assertEqual(re.compile(pattern, re.S).findall(b'xyz'),
[b'xyz'], msg=pattern)
def test_match_repr(self):
for string in '[abracadabra]', S('[abracadabra]'):
m = re.search(r'(.+)(.*?)\1', string)
self.assertEqual(repr(m), "<%s.%s object; "
"span=(1, 12), match='abracadabra'>" %
(type(m).__module__, type(m).__qualname__))
for string in (b'[abracadabra]', B(b'[abracadabra]'),
bytearray(b'[abracadabra]'),
memoryview(b'[abracadabra]')):
m = re.search(br'(.+)(.*?)\1', string)
self.assertEqual(repr(m), "<%s.%s object; "
"span=(1, 12), match=b'abracadabra'>" %
(type(m).__module__, type(m).__qualname__))
first, second = list(re.finditer("(aa)|(bb)", "aa bb"))
self.assertEqual(repr(first), "<%s.%s object; "
"span=(0, 2), match='aa'>" %
(type(second).__module__, type(first).__qualname__))
self.assertEqual(repr(second), "<%s.%s object; "
"span=(3, 5), match='bb'>" %
(type(second).__module__, type(second).__qualname__))
def test_bug_2537(self):
# issue 2537: empty submatches
for outer_op in ('{0,}', '*', '+', '{1,187}'):
for inner_op in ('{0,}', '*', '?'):
r = re.compile("^((x|y)%s)%s" % (inner_op, outer_op))
m = r.match("xyyzy")
self.assertEqual(m.group(0), "xyy")
self.assertEqual(m.group(1), "")
self.assertEqual(m.group(2), "y")
def test_debug_flag(self):
pat = r'(\.)(?:[ch]|py)(?(1)$|: )'
with captured_stdout() as out:
re.compile(pat, re.DEBUG)
dump = '''\
SUBPATTERN 1 0 0
LITERAL 46
SUBPATTERN None 0 0
BRANCH
IN
LITERAL 99
LITERAL 104
OR
LITERAL 112
LITERAL 121
SUBPATTERN None 0 0
GROUPREF_EXISTS 1
AT AT_END
ELSE
LITERAL 58
LITERAL 32
'''
self.assertEqual(out.getvalue(), dump)
# Debug output is output again even a second time (bypassing
# the cache -- issue #20426).
with captured_stdout() as out:
re.compile(pat, re.DEBUG)
self.assertEqual(out.getvalue(), dump)
def test_keyword_parameters(self):
# Issue #20283: Accepting the string keyword parameter.
pat = re.compile(r'(ab)')
self.assertEqual(
pat.match(string='abracadabra', pos=7, endpos=10).span(), (7, 9))
self.assertEqual(
pat.fullmatch(string='abracadabra', pos=7, endpos=9).span(), (7, 9))
self.assertEqual(
pat.search(string='abracadabra', pos=3, endpos=10).span(), (7, 9))
self.assertEqual(
pat.findall(string='abracadabra', pos=3, endpos=10), ['ab'])
self.assertEqual(
pat.split(string='abracadabra', maxsplit=1),
['', 'ab', 'racadabra'])
self.assertEqual(
pat.scanner(string='abracadabra', pos=3, endpos=10).search().span(),
(7, 9))
def test_bug_20998(self):
# Issue #20998: Fullmatch of repeated single character pattern
# with ignore case.
self.assertEqual(re.fullmatch('[a-c]+', 'ABC', re.I).span(), (0, 3))
def test_locale_caching(self):
# Issue #22410
oldlocale = locale.setlocale(locale.LC_CTYPE)
self.addCleanup(locale.setlocale, locale.LC_CTYPE, oldlocale)
for loc in 'en_US.iso88591', 'en_US.utf8':
try:
locale.setlocale(locale.LC_CTYPE, loc)
except locale.Error:
# Unsupported locale on this system
self.skipTest('test needs %s locale' % loc)
re.purge()
self.check_en_US_iso88591()
self.check_en_US_utf8()
re.purge()
self.check_en_US_utf8()
self.check_en_US_iso88591()
def check_en_US_iso88591(self):
locale.setlocale(locale.LC_CTYPE, 'en_US.iso88591')
self.assertTrue(re.match(b'\xc5\xe5', b'\xc5\xe5', re.L|re.I))
self.assertTrue(re.match(b'\xc5', b'\xe5', re.L|re.I))
self.assertTrue(re.match(b'\xe5', b'\xc5', re.L|re.I))
self.assertTrue(re.match(b'(?Li)\xc5\xe5', b'\xc5\xe5'))
self.assertTrue(re.match(b'(?Li)\xc5', b'\xe5'))
self.assertTrue(re.match(b'(?Li)\xe5', b'\xc5'))
def check_en_US_utf8(self):
locale.setlocale(locale.LC_CTYPE, 'en_US.utf8')
self.assertTrue(re.match(b'\xc5\xe5', b'\xc5\xe5', re.L|re.I))
self.assertIsNone(re.match(b'\xc5', b'\xe5', re.L|re.I))
self.assertIsNone(re.match(b'\xe5', b'\xc5', re.L|re.I))
self.assertTrue(re.match(b'(?Li)\xc5\xe5', b'\xc5\xe5'))
self.assertIsNone(re.match(b'(?Li)\xc5', b'\xe5'))
self.assertIsNone(re.match(b'(?Li)\xe5', b'\xc5'))
def test_error(self):
with self.assertRaises(re.error) as cm:
re.compile('(\u20ac))')
err = cm.exception
self.assertIsInstance(err.pattern, str)
self.assertEqual(err.pattern, '(\u20ac))')
self.assertEqual(err.pos, 3)
self.assertEqual(err.lineno, 1)
self.assertEqual(err.colno, 4)
self.assertIn(err.msg, str(err))
self.assertIn(' at position 3', str(err))
self.assertNotIn(' at position 3', err.msg)
# Bytes pattern
with self.assertRaises(re.error) as cm:
re.compile(b'(\xa4))')
err = cm.exception
self.assertIsInstance(err.pattern, bytes)
self.assertEqual(err.pattern, b'(\xa4))')
self.assertEqual(err.pos, 3)
# Multiline pattern
with self.assertRaises(re.error) as cm:
re.compile("""
(
abc
)
)
(
""", re.VERBOSE)
err = cm.exception
self.assertEqual(err.pos, 77)
self.assertEqual(err.lineno, 5)
self.assertEqual(err.colno, 17)
self.assertIn(err.msg, str(err))
self.assertIn(' at position 77', str(err))
self.assertIn('(line 5, column 17)', str(err))
def test_misc_errors(self):
self.checkPatternError(r'(', 'missing ), unterminated subpattern', 0)
self.checkPatternError(r'((a|b)', 'missing ), unterminated subpattern', 0)
self.checkPatternError(r'(a|b))', 'unbalanced parenthesis', 5)
self.checkPatternError(r'(?P', 'unexpected end of pattern', 3)
self.checkPatternError(r'(?z)', 'unknown extension ?z', 1)
self.checkPatternError(r'(?iz)', 'unknown flag', 3)
self.checkPatternError(r'(?i', 'missing -, : or )', 3)
self.checkPatternError(r'(?#abc', 'missing ), unterminated comment', 0)
self.checkPatternError(r'(?<', 'unexpected end of pattern', 3)
self.checkPatternError(r'(?<>)', 'unknown extension ?<>', 1)
self.checkPatternError(r'(?', 'unexpected end of pattern', 2)
def test_enum(self):
# Issue #28082: Check that str(flag) returns a human readable string
# instead of an integer
self.assertIn('ASCII', str(re.A))
self.assertIn('DOTALL', str(re.S))
def test_pattern_compare(self):
pattern1 = re.compile('abc', re.IGNORECASE)
# equal to itself
self.assertEqual(pattern1, pattern1)
self.assertFalse(pattern1 != pattern1)
# equal
re.purge()
pattern2 = re.compile('abc', re.IGNORECASE)
self.assertEqual(hash(pattern2), hash(pattern1))
self.assertEqual(pattern2, pattern1)
# not equal: different pattern
re.purge()
pattern3 = re.compile('XYZ', re.IGNORECASE)
# Don't test hash(pattern3) != hash(pattern1) because there is no
# warranty that hash values are different
self.assertNotEqual(pattern3, pattern1)
# not equal: different flag (flags=0)
re.purge()
pattern4 = re.compile('abc')
self.assertNotEqual(pattern4, pattern1)
# only == and != comparison operators are supported
with self.assertRaises(TypeError):
pattern1 < pattern2
def test_pattern_compare_bytes(self):
pattern1 = re.compile(b'abc')
# equal: test bytes patterns
re.purge()
pattern2 = re.compile(b'abc')
self.assertEqual(hash(pattern2), hash(pattern1))
self.assertEqual(pattern2, pattern1)
# not equal: pattern of a different types (str vs bytes),
# comparison must not raise a BytesWarning
re.purge()
pattern3 = re.compile('abc')
with warnings.catch_warnings():
warnings.simplefilter('error', BytesWarning)
self.assertNotEqual(pattern3, pattern1)
class PatternReprTests(unittest.TestCase):
def check(self, pattern, expected):
self.assertEqual(repr(re.compile(pattern)), expected)
def check_flags(self, pattern, flags, expected):
self.assertEqual(repr(re.compile(pattern, flags)), expected)
def test_without_flags(self):
self.check('random pattern',
"re.compile('random pattern')")
def test_single_flag(self):
self.check_flags('random pattern', re.IGNORECASE,
"re.compile('random pattern', re.IGNORECASE)")
def test_multiple_flags(self):
self.check_flags('random pattern', re.I|re.S|re.X,
"re.compile('random pattern', "
"re.IGNORECASE|re.DOTALL|re.VERBOSE)")
def test_unicode_flag(self):
self.check_flags('random pattern', re.U,
"re.compile('random pattern')")
self.check_flags('random pattern', re.I|re.S|re.U,
"re.compile('random pattern', "
"re.IGNORECASE|re.DOTALL)")
def test_inline_flags(self):
self.check('(?i)pattern',
"re.compile('(?i)pattern', re.IGNORECASE)")
def test_unknown_flags(self):
self.check_flags('random pattern', 0x123000,
"re.compile('random pattern', 0x123000)")
self.check_flags('random pattern', 0x123000|re.I,
"re.compile('random pattern', re.IGNORECASE|0x123000)")
def test_bytes(self):
self.check(b'bytes pattern',
"re.compile(b'bytes pattern')")
self.check_flags(b'bytes pattern', re.A,
"re.compile(b'bytes pattern', re.ASCII)")
def test_locale(self):
self.check_flags(b'bytes pattern', re.L,
"re.compile(b'bytes pattern', re.LOCALE)")
def test_quotes(self):
self.check('random "double quoted" pattern',
'''re.compile('random "double quoted" pattern')''')
self.check("random 'single quoted' pattern",
'''re.compile("random 'single quoted' pattern")''')
self.check('''both 'single' and "double" quotes''',
'''re.compile('both \\'single\\' and "double" quotes')''')
def test_long_pattern(self):
pattern = 'Very %spattern' % ('long ' * 1000)
r = repr(re.compile(pattern))
self.assertLess(len(r), 300)
self.assertEqual(r[:30], "re.compile('Very long long lon")
r = repr(re.compile(pattern, re.I))
self.assertLess(len(r), 300)
self.assertEqual(r[:30], "re.compile('Very long long lon")
self.assertEqual(r[-16:], ", re.IGNORECASE)")
class ImplementationTest(unittest.TestCase):
"""
Test implementation details of the re module.
"""
def test_overlap_table(self):
f = sre_compile._generate_overlap_table
self.assertEqual(f(""), [])
self.assertEqual(f("a"), [0])
self.assertEqual(f("abcd"), [0, 0, 0, 0])
self.assertEqual(f("aaaa"), [0, 1, 2, 3])
self.assertEqual(f("ababba"), [0, 0, 1, 2, 0, 1])
self.assertEqual(f("abcabdac"), [0, 0, 0, 1, 2, 0, 1, 0])
class ExternalTests(unittest.TestCase):
def test_re_benchmarks(self):
're_tests benchmarks'
from test.re_tests import benchmarks
for pattern, s in benchmarks:
with self.subTest(pattern=pattern, string=s):
p = re.compile(pattern)
self.assertTrue(p.search(s))
self.assertTrue(p.match(s))
self.assertTrue(p.fullmatch(s))
s2 = ' '*10000 + s + ' '*10000
self.assertTrue(p.search(s2))
self.assertTrue(p.match(s2, 10000))
self.assertTrue(p.match(s2, 10000, 10000 + len(s)))
self.assertTrue(p.fullmatch(s2, 10000, 10000 + len(s)))
def test_re_tests(self):
're_tests test suite'
from test.re_tests import tests, SUCCEED, FAIL, SYNTAX_ERROR
for t in tests:
pattern = s = outcome = repl = expected = None
if len(t) == 5:
pattern, s, outcome, repl, expected = t
elif len(t) == 3:
pattern, s, outcome = t
else:
raise ValueError('Test tuples should have 3 or 5 fields', t)
with self.subTest(pattern=pattern, string=s):
if outcome == SYNTAX_ERROR: # Expected a syntax error
with self.assertRaises(re.error):
re.compile(pattern)
continue
obj = re.compile(pattern)
result = obj.search(s)
if outcome == FAIL:
self.assertIsNone(result, 'Succeeded incorrectly')
continue
with self.subTest():
self.assertTrue(result, 'Failed incorrectly')
# Matched, as expected, so now we compute the
# result string and compare it to our expected result.
start, end = result.span(0)
vardict = {'found': result.group(0),
'groups': result.group(),
'flags': result.re.flags}
for i in range(1, 100):
try:
gi = result.group(i)
# Special hack because else the string concat fails:
if gi is None:
gi = "None"
except IndexError:
gi = "Error"
vardict['g%d' % i] = gi
for i in result.re.groupindex.keys():
try:
gi = result.group(i)
if gi is None:
gi = "None"
except IndexError:
gi = "Error"
vardict[i] = gi
self.assertEqual(eval(repl, vardict), expected,
'grouping error')
# Try the match with both pattern and string converted to
# bytes, and check that it still succeeds.
try:
bpat = bytes(pattern, "ascii")
bs = bytes(s, "ascii")
except UnicodeEncodeError:
# skip non-ascii tests
pass
else:
with self.subTest('bytes pattern match'):
obj = re.compile(bpat)
self.assertTrue(obj.search(bs))
# Try the match with LOCALE enabled, and check that it
# still succeeds.
with self.subTest('locale-sensitive match'):
obj = re.compile(bpat, re.LOCALE)
result = obj.search(bs)
if result is None:
print('=== Fails on locale-sensitive match', t)
# Try the match with the search area limited to the extent
# of the match and see if it still succeeds. \B will
# break (because it won't match at the end or start of a
# string), so we'll ignore patterns that feature it.
if (pattern[:2] != r'\B' and pattern[-2:] != r'\B'
and result is not None):
with self.subTest('range-limited match'):
obj = re.compile(pattern)
self.assertTrue(obj.search(s, start, end + 1))
# Try the match with IGNORECASE enabled, and check that it
# still succeeds.
with self.subTest('case-insensitive match'):
obj = re.compile(pattern, re.IGNORECASE)
self.assertTrue(obj.search(s))
# Try the match with UNICODE locale enabled, and check
# that it still succeeds.
with self.subTest('unicode-sensitive match'):
obj = re.compile(pattern, re.UNICODE)
self.assertTrue(obj.search(s))
if __name__ == "__main__":
unittest.main()
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