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[3.11] gh-100061: Proper fix of the bug in the matching of possessive quantifiers (GH-102612) (GH-108004)

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Restore the global Input Stream pointer after trying to match a sub-pattern.

Co-authored-by: Ma Lin <animalize@users.noreply.github.com>

(cherry picked from commit abd9cc52d9)
    
Co-authored-by: SKO <41810398+uyw4687@users.noreply.github.com>
This commit is contained in:
Serhiy Storchaka 2023-08-16 11:36:36 +03:00 • committed by GitHub
parent 4f35d4f6f2
commit 26137e2cf7
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4 changed files with 16 additions and 9 deletions
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12
Lib/test/test_re.py
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@ -2397,6 +2397,16 @@ def test_template_function_and_flag_is_deprecated(self):
self.assertFalse(template_re1.match('nope'))
def test_bug_gh106052(self):
# gh-100061
self.assertEqual(re.match('(?>(?:.(?!D))+)', 'ABCDE').span(), (0, 2))
self.assertEqual(re.match('(?:.(?!D))++', 'ABCDE').span(), (0, 2))
self.assertEqual(re.match('(?>(?:.(?!D))*)', 'ABCDE').span(), (0, 2))
self.assertEqual(re.match('(?:.(?!D))*+', 'ABCDE').span(), (0, 2))
self.assertEqual(re.match('(?>(?:.(?!D))?)', 'CDE').span(), (0, 0))
self.assertEqual(re.match('(?:.(?!D))?+', 'CDE').span(), (0, 0))
self.assertEqual(re.match('(?>(?:.(?!D)){1,3})', 'ABCDE').span(), (0, 2))
self.assertEqual(re.match('(?:.(?!D)){1,3}+', 'ABCDE').span(), (0, 2))
# gh-106052
self.assertEqual(re.match("(?>(?:ab?c)+)", "aca").span(), (0, 2))
self.assertEqual(re.match("(?:ab?c)++", "aca").span(), (0, 2))
self.assertEqual(re.match("(?>(?:ab?c)*)", "aca").span(), (0, 2))
@ -2502,7 +2512,6 @@ def test_atomic_group(self):
17: SUCCESS
''')
@unittest.expectedFailure # gh-106052
def test_possesive_repeat_one(self):
self.assertEqual(get_debug_out(r'a?+'), '''\
POSSESSIVE_REPEAT 0 1
@ -2515,7 +2524,6 @@ def test_possesive_repeat_one(self):
12: SUCCESS
''')
@unittest.expectedFailure # gh-106052
def test_possesive_repeat(self):
self.assertEqual(get_debug_out(r'(?:ab)?+'), '''\
POSSESSIVE_REPEAT 0 1