使用正则表达式查找bash不区分大小写 [英] bash find using regex is not case sensitive

问题描述

我需要找到以三个小写字母开头的文件，但是由于某种原因，我遇到了不希望的不区分大小写的行为.我正在使用带有-regex选项的find，但是它甚至可以找到以大写字母开头的文件.

I need to find files starting with three lowercase letters but for some reason I'm getting an undesired case-insensitive behavior. I'm using find with the -regex option but it finds even the files starting with capital.

$ find . -regextype posix-egrep -regex '.*/[a-z]{3}\w+\.abc'
./TTTxxx.abc
./tttyyy.abc

打印与以下内容相同:

$ find . -regextype posix-egrep -regex '.*/[A-Z]{3}\w+\.abc'
./TTTxxx.abc
./tttyyy.abc

如果我不是使用一个字符范围，而是使用一个字符，那么它会敏感，只打印小写文件.

If instead of using a range of characters I use a single character, works as sensitive, printing only the lowercase file.

find . -regextype posix-egrep -regex '.*/[t]{3}\w+\.abc'
./tttyyy.abc

我尝试使用不同的正则表达式，结果是相同的.

I've tried using different regextypes and the result is the same.

此外，一个egrep似乎可以正常工作:

In addition, an egrep to seems to work:

find . -regextype posix-egrep -regex '.*/.+\.abc' |  egrep '/[a-z]\w+\.abc'
./tttyyy.abc

为什么使用char范围时"find -regex"不区分大小写?

Why is the "find -regex" case-insensitive when using a char range ?

注意:，我需要使用find命令，因为我需要使用-exec选项.

Note: I need to use find as I need the -exec option.

非常感谢.

推荐答案

根据

Accroding to Why does [A-Z] match lowercase letters in bash?, the collation is the issue here:

带有语言环境(例如en_US)的标准归类具有以下顺序:

Standard collations with locales such as en_US have the following order:

aAbBcC ... xXyYzZ

a 和 z (在 [a-z] 中)之间的所有大写字母，但 Z 除外.在 A 和 Z 之间(在 [AZ] 中)是所有小写字母，除了 a .

Between a and z (in [a-z]) are ALL uppercase letters, except for Z. Between A and Z (in [A-Z]) are ALL lowercase letters, except for a.

因此，您需要显式列出所有小写字母或更改排序规则: $ export LC_COLLATE = C 并使用标准的 [a-z] .

So you need to list explicitly all lowercase letters or change the collation: $ export LC_COLLATE=C and use standard [a-z].

[...] {3} \ w \ .abc -此模式，其中 [...] 是 [az] 或列出的小写字母，将为您提供文件名.

[...]{3}\w\.abc - this pattern, where [...] is [a-z] or lowercase letters listed, will get you filenames.

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