New submission from Serhiy Storchaka: Currently the re module accepts octal escapes from \400 to \777, but ignore highest bit.
>>> re.search(r'\542', 'abc') <_sre.SRE_Match object; span=(1, 2), match='b'> This behavior looks surprising and is inconsistent with the regex module which preserve highest bit. Such escaping is not portable across different regular exception engines. I propose to add a warning when octal escape value is larger than 0o377. Here is preliminary patch which adds UserWarning. Or may be better to emit DeprecationWarning and then replace it by ValueError in future releases? ---------- components: Library (Lib), Regular Expressions files: re_octal_escape_overflow.patch keywords: patch messages: 226570 nosy: ezio.melotti, mrabarnett, pitrou, serhiy.storchaka priority: normal severity: normal stage: patch review status: open title: Warn about octal escapes > 0o377 in re type: enhancement versions: Python 3.5 Added file: http://bugs.python.org/file36571/re_octal_escape_overflow.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22362> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
