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gh-140797: Forbid capturing groups in re.Scanner lexicon patterns (GH-140944)

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Abhishek Tiwari 2025-11-04 16:24:28 +05:30 • committed by GitHub
parent a84181c31b
commit fa9c3eefd4
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3 changed files with 24 additions and 1 deletions
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5
Lib/re/__init__.py
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@ -397,9 +397,12 @@ def __init__(self, lexicon, flags=0):
s = _parser.State()
s.flags = flags
for phrase, action in lexicon:
sub_pattern = _parser.parse(phrase, flags)
if sub_pattern.state.groups != 1:
raise ValueError("Cannot use capturing groups in re.Scanner")
gid = s.opengroup()
p.append(_parser.SubPattern(s, [
(SUBPATTERN, (gid, 0, 0, _parser.parse(phrase, flags))),
(SUBPATTERN, (gid, 0, 0, sub_pattern)),
]))
s.closegroup(gid, p[-1])
p = _parser.SubPattern(s, [(BRANCH, (None, p))])