How to process given text in bash?

Question

linux

Good day!
There was a problem parsing a config file using bash.
An example input file to be parsed:

RF='' 		# свободно в каталоге /
VF='' 		# свободно в каталоге /var


[keys1]
        key1='1'
        key2='2'
        key3='3'
        key4='4'
[keys2]
        key1='1'
        key2='2'
        key3='3'
        key4='4'

I would like to get all the text in the block by key for further processing using grep. For example, the block by key keys2 looks like this:

[keys2]
        key1='1'
        key2='2'
        key3='3'
        key4='4'

As far as I understand, sed cannot cope with this task, because it reads the text line by line. Perhaps there are some other utilities that can be used to do this. Or is it impossible to do without the use of normal EPs?

Answer 1

sed -rn '/\[keys2\]/,/^[^ ]/{/ +/p}' file.txt

Answer 2

You can do this:
We search and display the lines starting from the one where we found "[keys2]" and up to the beginning of the next block.