sed错误:“对‘s’命令的RHS无效引用\1”

I run several substitution commands as the core of a colorize script for maven. One of the sed commands uses a regular expression which works find in the shell as discussed here. The current (not working) implementation can be found here.

我运行几个替换命令作为maven的彩色脚本的核心。其中一个sed命令使用了一个正则表达式，该表达式在这里讨论。在这里可以找到当前(不工作的)实现。

When I include one of the variants of the command into the script different behavior occurs:

当我将命令的一个变体包含到脚本中时，会发生不同的行为:

Variant 1:

版本1:

$ sed -re "s/([a-zA-Z0-9./\\ :-]+)/\1/g"

Adapted to the script:

适应了脚本:

-re "s/WARNING: ([a-zA-Z0-9./\\ :-]+)/${warn}WARNING: \1${c_end}/g" \

Error: The shell outputs the same information as if I would type $ sed. Strange!?

错误:shell输出相同的信息，就好像我要输入$ sed。奇怪! ?

Variant 2:

版本2:

$ sed -e "s/\([a-zA-Z0-9./\\ :-]\+\)/\1/g"

Adapted to the script:

适应了脚本:

-e "s/WARNING: \([a-zA-Z0-9./\\ :-]\+\)/${warn}WARNING: \1${c_end}/g" \

Error:

错误:

sed: -e expression #7, char 59: invalid reference \1 on `s' command's RHS

sed: -e表达式#7,char 59:对's '命令的RHS无效引用\1。

3 个解决方案

#1

Don't you need to actually capture for that to work? i.e. for variant 2:

难道你不需要抓住这个机会去工作吗?例如变种2:

-r -e "s/WARNING: (\([a-zA-Z0-9./\\ :-]\+\))/${warn}WARNING: \1${c_end}/g" \

(Note: untested)

(注:未测试)

Without the -r argument back-references (like \1) won't work.

如果没有-r参数，反向引用(如\1)不会起作用。

#2

This error is common for parentheses that are not escaped. Escape them and try again.

这个错误在没有转义的括号中是常见的。逃离他们，再试一次。

For example:

例如:

/^$/b
:loop
$!{
N
/\n$/!b loop
}
s/\n(.)/\1/g

Should be escaped with backslashes before each parenthesis:

在每个括号之前，应该用反斜杠来转义:

/^$/b
:loop
$!{
N
/\n$/!b loop
}
s/\n\(.\)/\1/g

#3

You need escape the / after the .

你需要逃离。

sed -e "s/\([a-zA-Z0-9.\/\\ :-]\+\)/\1/g"

Or if you don't want to worry about escaping, use |

或者如果你不想担心逃跑，用|。

sed -e "s|\([a-zA-Z0-9./\\ :-]\+\)|\1|g"

EDIT:

编辑:

sed -e "s|WARNING: \([a-zA-Z0-9.-/\\ :]+\)|${warn}WARNING: \1${c_end}|g"

#1