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bug#64128: regexp parser zero-width assertion bugs
From: |
Paul Eggert |
Subject: |
bug#64128: regexp parser zero-width assertion bugs |
Date: |
Mon, 19 Jun 2023 13:40:06 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 |
On 2023-06-19 12:52, Mattias Engdegård wrote:
Sure, we can turn \b and \B into group B assertions, but the patch was more
conservative in nature.
OK, but we still need to fix this, as \b and \B should not be a special
case for following "*".
I think we have to preserve \`* meaning \`\* for compatibility, historical or
not, because it's something we keep sighting in the wild.
That makes some sense, in that \` is like ^, and ^ is already a special
case (this is true even in POSIX BREs).
In other words, how about if we change the groups from your list:
Group A: ^ $ \` \' \b \B
Group B: \< \> \_< \_> \=
to this:
Group A: ^ \`
Group B: $ \' \b \B \< \> \_< \_> \=
where "*" is ordinary after Group A, and special after Group B and there
is no other squirrelly behavior. And similarly for the other repetition
operators.
Attached is a proposed doc change for this, which I have not installed.
Of course the code and etc/NEWS would need changing too.
0001-Document-proposed-regex-fix-bug-64128.patch
Description: Text Data
- bug#64128: regexp parser zero-width assertion bugs, (continued)
- bug#64128: regexp parser zero-width assertion bugs, Stefan Monnier, 2023/06/18
- bug#64128: regexp parser zero-width assertion bugs, Mattias Engdegård, 2023/06/19
- bug#64128: regexp parser zero-width assertion bugs, Stefan Monnier, 2023/06/19
- bug#64128: regexp parser zero-width assertion bugs, Mattias Engdegård, 2023/06/19
- bug#64128: regexp parser zero-width assertion bugs, Paul Eggert, 2023/06/19
- bug#64128: regexp parser zero-width assertion bugs, Mattias Engdegård, 2023/06/19
- bug#64128: regexp parser zero-width assertion bugs, Stefan Monnier, 2023/06/19
- bug#64128: regexp parser zero-width assertion bugs, Mattias Engdegård, 2023/06/20
- bug#64128: regexp parser zero-width assertion bugs, Paul Eggert, 2023/06/21
- bug#64128: regexp parser zero-width assertion bugs, Mattias Engdegård, 2023/06/21
- bug#64128: regexp parser zero-width assertion bugs,
Paul Eggert <=
- bug#64128: regexp parser zero-width assertion bugs, Paul Eggert, 2023/06/19