sed替换部分字符串

Question

我想用sed做以下几点

情况1:

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

我想在constant =之后直接替换randomvalue,同时保持线的其余部分保持原样,结果如下:

*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*

类似于第一个但是在constant = string之后有一个空格,所以输出就是

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

对于我一直在尝试使用的案例:

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

Answer 1

你可以使用这个sed:

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