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[3.12] gh-109747: Improve errors for unsupported look-behind patterns (GH-109859) (GH-110859)

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Now re.error is raised instead of OverflowError or RuntimeError for
too large width of look-behind pattern.

The limit is increased to 2**32-1 (was 2**31-1).
(cherry picked from commit e2b3d831fd)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2023-10-14 08:42:19 +02:00 • committed by GitHub
parent 12b9cb80be
commit a2cc9a4c3a
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6 changed files with 46 additions and 13 deletions
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4
Lib/re/_compiler.py
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@ -149,6 +149,8 @@ def _compile(code, pattern, flags):
emit(0) # look ahead
else:
lo, hi = av[1].getwidth()
if lo > MAXCODE:
raise error("looks too much behind")
if lo != hi:
raise error("look-behind requires fixed-width pattern")
emit(lo) # look behind
@ -549,7 +551,7 @@ def _compile_info(code, pattern, flags):
else:
emit(MAXCODE)
prefix = prefix[:MAXCODE]
emit(min(hi, MAXCODE))
emit(hi)
# add literal prefix
if prefix:
emit(len(prefix)) # length