sed 替换部分字符串 [英] sed to replace partial string

问题描述

我想使用 sed 执行以下操作

I would like to do the following by using sed

情况 1:

*here is some random text constant=randomValue some more random text*

我想直接在 constant= 之后替换随机值，同时保持该行的其余部分完好无损，因此结果如下所示:

I would like to replace randomvalue directly after constant= while keeping the rest of the line intact so the result would look like:

*here is some random text constant=substituteValue some more random text*

案例 2:

*here is some random text constant= randomValue some more random text*

与第一个类似，但在 constant= 字符串后有一个空格，因此输出将是

similar to the first one but with a space after the constant= string, so the output would be

*here is some random text constant= substituteValue some more random text*

对于我一直在尝试使用的案例一:

For case one i've been trying to use:

echo $line | sed 's/server=.*\ /sever=\<SrvrName\>/'

推荐答案

你可以使用这个 sed:

You can use this sed:

sed 's/\( constant = *\)[^ ]*/\1substituteValue/' <<< "$line"

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