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bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x)
From: |
Jim Meyering |
Subject: |
bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales |
Date: |
Sat, 11 Jan 2014 20:36:31 -0800 |
On Sat, Jan 11, 2014 at 6:15 AM, Pádraig Brady <address@hidden> wrote:
> On 01/11/2014 11:33 AM, Pádraig Brady wrote:
...
> This is also a good summary of stuff to consider with case:
> http://www.unicode.org/faq/casemap_charprop.html
>
> So picking another case situation from there:
> "in the Greek script, capital sigma (U+03A3) is the uppercase form of both
> the regular (U+03C2) and final (U+03C3) lowercase sigma."
>
> One can see that sed handles this:
> $ printf '\u03C2\u03C3\n' | sed 's/.*/&\U&/'
> ςσΣΣ
> $ printf '\u03A3\n' | sed 's/.*/&\L&/'
> Σσ
>
> Though I was surprised the grep (2.14) didn't match any combo of these
> $ printf '\u03C2\u03C3\n' | grep -Fi "$(printf \u03A3)"
> $ printf '\u03A3\n' | grep -Fi "$(printf \u03C2)"
> $ printf '\u03A3\n' | grep -Fi "$(printf \u03C3)"
Actually, if you quote the argument to the latter printf, two of those
do match, both with -F and without:
$ printf '\u03C2\u03C3\n' | grep -Fi "$(printf '\u03A3')"
ςσ
$ printf '\u03A3\n' | grep -Fi "$(printf '\u03C2')"
$ printf '\u03A3\n' | grep -Fi "$(printf '\u03C3')"
Σ
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales, Jim Meyering, 2014/01/07
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales, Pádraig Brady, 2014/01/10
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales, Jim Meyering, 2014/01/10
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales, Jim Meyering, 2014/01/11
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales, Pádraig Brady, 2014/01/11
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales, Pádraig Brady, 2014/01/11
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales, Jim Meyering, 2014/01/11
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales,
Jim Meyering <=
- bug#16232: [PATCH] grep: make --ignore-case (-i) faster (sometimes 10x) in multibyte locales, Pádraig Brady, 2014/01/12