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gh-109747: Improve errors for unsupported look-behind patterns (GH-109859)

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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).
This commit is contained in:
Serhiy Storchaka 2023-10-14 09:13:02 +03:00 • committed by GitHub
parent ca0f3d858d
commit e2b3d831fd
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6 changed files with 46 additions and 13 deletions
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Modules/_sre/sre.c
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@ -2070,8 +2070,6 @@ _validate_inner(SRE_CODE *code, SRE_CODE *end, Py_ssize_t groups)
GET_SKIP;
GET_ARG; /* 0 for lookahead, width for lookbehind */
code--; /* Back up over arg to simplify math below */
if (arg & 0x80000000)
FAIL; /* Width too large */
/* Stop 1 before the end; we check the SUCCESS below */
if (_validate_inner(code+1, code+skip-2, groups))
FAIL;