Replace variable value on a specific section of config file using bash - regex

Question

I have a config file that looks like this:
...
[env.staging]
name = "something"
...
[env.production]
name = "something"
...
I'm trying to replace the value of name on a specific environment using regex in the sed command in bash, but when I try to find the line by its section followed by a New Line, it doesn't work:
sed -i -e '/\[env\.production\]\nname =/s/=.*/= \"something_else\"/' config.toml
But the following command works fine, and of course, changes the name variable of both environments which is not desired.
sed -i -e '/name =/s/=.*/= \"something_else\"/' config.toml
Any ideas on how to achieve the correct result? (All my files are using LF line endings)

Answer 1

sed works line by line by default. You cannot match across multiple lines unless you use features to bring in multiple lines to the pattern space.
$ sed '/\[env\.production]/ {n; s/=.*/= "something_else"/}' config.toml
...
[env.staging]
name = "something"
...
[env.production]
name = "something_else"
...
n command will replace the pattern space with the next line. Use N when you need to process both lines together.
{} is used to group commands.
I would also suggest to use a toml tool like dasel instead of sed for such cases.

Answer 2

I've created some additional sample data for demonstration purposes:
$ cat config.toml
...
[env.staging]
id = 1
name = "something"
name2 = "something"
date = 2021/08/03
...
[env.production]
id = 2
name = "something"
name2 = "something"
date = 2022/01/23
...
[env.test]
id = 3
name = "something"
name2 = "something"
date = 2021/11/15
...
One sed idea using a range to find the desired section and then apply the change to said section:
$ sed '/\[env.production\]/,/^name = ".*$/ s/^name = ".*$/name = "something_else"/' config.toml
...
[env.staging]
id = 1
name = "something"
name2 = "something"
date = 2021/08/03
...
[env.production]
id = 2
name = "something_else"
name2 = "something"
date = 2022/01/23
...
[env.test]
id = 3
name = "something"
name2 = "something"
date = 2021/11/15
...
NOTES:
we don't know what the rest of the config sections look like so I went a bit overboard by specifying the entire line (^name = ".*$)
once OP is satisfied with the answer the -i option can be added to perform the 'in place' update of config.toml