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

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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>
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SKO 2023-08-16 16:43:45 +09:00 • committed by GitHub
parent a86df298df
commit abd9cc52d9
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4 changed files with 17 additions and 10 deletions
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7
Lib/re/_compiler.py
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@ -100,13 +100,6 @@ def _compile(code, pattern, flags):
emit(ANY_ALL)
else:
emit(ANY)
elif op is POSSESSIVE_REPEAT:
# gh-106052: Possessive quantifiers do not work when the
# subpattern contains backtracking, i.e. "(?:ab?c)*+".
# Implement it as equivalent greedy qualifier in atomic group.
p = [(MAX_REPEAT, av)]
p = [(ATOMIC_GROUP, p)]
_compile(code, p, flags)
elif op in REPEATING_CODES:
if _simple(av[2]):
emit(REPEATING_CODES[op][2])