diff options
Diffstat (limited to 'Lib/test/test_re.py')
| -rw-r--r-- | Lib/test/test_re.py | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py index 301d4a51656..1eca22f4537 100644 --- a/Lib/test/test_re.py +++ b/Lib/test/test_re.py @@ -1861,6 +1861,29 @@ class ReTests(unittest.TestCase): self.assertRaises(OverflowError, re.compile, r".{%d,}?" % 2**128) self.assertRaises(OverflowError, re.compile, r".{%d,%d}" % (2**129, 2**128)) + def test_look_behind_overflow(self): + string = "x" * 2_500_000 + p1 = r"(?<=((.{%d}){%d}){%d})" + p2 = r"(?<!((.{%d}){%d}){%d})" + # Test that the templates are valid and look-behind with width 2**21 + # (larger than sys.maxunicode) are supported. + self.assertEqual(re.search(p1 % (2**7, 2**7, 2**7), string).span(), + (2**21, 2**21)) + self.assertEqual(re.search(p2 % (2**7, 2**7, 2**7), string).span(), + (0, 0)) + # Test that 2**22 is accepted as a repetition number and look-behind + # width. + re.compile(p1 % (2**22, 1, 1)) + re.compile(p1 % (1, 2**22, 1)) + re.compile(p1 % (1, 1, 2**22)) + re.compile(p2 % (2**22, 1, 1)) + re.compile(p2 % (1, 2**22, 1)) + re.compile(p2 % (1, 1, 2**22)) + # But 2**66 is too large for look-behind width. + errmsg = "looks too much behind" + self.assertRaisesRegex(re.error, errmsg, re.compile, p1 % (2**22, 2**22, 2**22)) + self.assertRaisesRegex(re.error, errmsg, re.compile, p2 % (2**22, 2**22, 2**22)) + def test_backref_group_name_in_exception(self): # Issue 17341: Poor error message when compiling invalid regex self.checkPatternError('(?P=<foo>)', |