[vim/vim] Unicode character ſ is matched as itself and as 's.' (Issue #14294)
diffsetter
Steps to reproduce
- Open a utf8 encoded file in vim containing the line "Die Gleichheit fordert das Nachdenken heraus durch Fragen, die ſich daran knüpfen und nicht ganz leicht zu beantworten ſind."
- use
:set ignorecase - replace the character ſ by s using
:%s/\%u017F/s/g
Expected behaviour
The two occurrences of 'ſ' will be replaced by 's' resulting in "Die Gleichheit fordert das Nachdenken heraus durch Fragen, die sich daran knüpfen und nicht ganz leicht zu beantworten sind." However, the actual result is "Die Gleichheit fordert dasNachdenken herausdurch Fragen, die sich daran knüpfen und nicht ganz leicht zu beantworten sind.", i.e., the two original s characters together with the following character are also replaced by 's' as if I had used the command :%s/s./s/g. See also this discussion.
Version of Vim
9.1.151 but also older like 8.0
Environment
system: x86_64 GNU/Linux
terminal: konsole, linux
$TERM: linux, xterm-256color
$LANG: de_DE.UTF-8, en_GB.UTF-8, C.UTF-8
Logs and stack traces
No response
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Christian Brabandt
hm, it works with :set regexpengine=1
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diffsetter
hm, it works with
:set regexpengine=1
Indeed, it does. But does that mean it's not a bug? I didn't know that option. The help file says: "Note that when using the NFA engine [the one that must have been chosen by vim automatically in this case] and the pattern contains something that is not supported the pattern will not match…" But here something is matched that shouldn't have been matched.
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Restorer
It kind of reminds me of this. issues #12579
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Christian Brabandt
yes and also related: #13682
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Christian Brabandt
I checked it and I think I found the issue. However, I have a question. Can I assume correctly, that 'ſ' should match the lower case 's' if ignoring case?
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Christian Brabandt
Closed #14294 as completed via 7a27c10.
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Christian Brabandt
Reopened #14294.
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Yegappan Lakshmanan
Closed #14294 as completed via yegappan/neovim@f494084.
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Christian Brabandt
that was closed unexpectedly. Let's re-open
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Christian Brabandt
Reopened #14294.
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Christian Brabandt
Closed #14294 as completed via 22e8e12.
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