sed(以bash格式)可与[\ t]一起使用，但不能与\ s一起使用? [英] sed (in bash) works with [ \t] but not with \s?

问题描述

我想在bash命令行上搜索替换包含空格的内容，并且我认为sed是最简单的方法.

I want to search-replace something containing whitespace on a bash command line, and I assumed sed would be the easiest way to go.

使用[ \t]表示制表符或空格以匹配空白，可以按预期工作:

Using [ \t] denoting either tab or space, to match the whitespace, works as intended:

echo "abc xyz" | sed "s/[ \t]xyz/123/"
abc123

但是，用\s代替[ \t]却没有，令我惊讶的是:

But using \s instead of [ \t] does not, to my surprise:

echo "abc xyz" | sed "s/\sxyz/123/"
abc xyz

我对bash还是比较陌生，所以我可能会错过一些琐碎的事情，但是无论我做什么，我都无法使它正常工作.使用\\s代替\s，使用单引号('代替")，将空格标记放在方括号内(例如[\s]甚至[\\s])，似乎没有任何帮助.

I'm fairly new to bash so I might be missing something trivial, but no matter what I do, I can't get this to work. Using \\s instead of \s, using single quotes (' instead of "), putting the whitespace marker inside square brackets (like [\s] or even [\\s]), nothing seems to help..?

(编辑)，以防一个sed/bash版本与另一个版本不同:我在这里使用OSX.

(edit) in case it differs from one sed / bash version to another: I'm working on OS X here.

此外，我注意到，当我在[ \t]空格部分之后添加+时，可以有选择地捕获多个空格/制表符(如果存在)，那么它将不再起作用... ??

Additionally, I noticed that when I add a + after the [ \t] whitespace part, to optionally grab multiple space/tab characters if present, it doesn't work anymore either...??

echo "abc xyz" | sed "s/[ \t]+xyz/123/"
abc xyz

(同样，也尝试使用\+而不是+，并且用单引号代替双引号，无济于事)

(and again, also tried with \+ instead of +, and single quotes instead of double quotes, nothing helps)

推荐答案

如SuperUser的如何在sed中匹配空格?:

As seen in SuperUser's How to match whitespace in sed?:

为了符合POSIX，请使用字符类[[:space:]]代替 \ s，因为后者是GNU sed扩展名

For POSIX compliance, use the character class [[:space:]] instead of \s, since the latter is a GNU sed extension

因此您可能正在运行非GNU sed版本，因此\s对您不起作用.

So you are probably running a non-GNU sed version, hence \s not working to you.

您有两种解决方案:

• 像您一样，同时使用(空格)和\t.
• 要使用[[:space:]].

• To use (space) and \t together, like you were doing.
• To use [[:space:]].

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