How does pcregrep works?

I have a file:

This error
-this
-this
-that
[text I want]
This error
-asd
-asfag
-adsfhs
[text I want]
[text I want]
This error
-asdgsda
-asdgg
-gasdg

I want to match to match except This error and next three lines, I can use: pcregrep -vM 'This error\n.*\n.*\n' file It gives output:

[text I want]
[text I want]
[text I want]

However, instead of removing them if I want to match them using the same command(by removing v): pcregrep -M 'This error\n.*\n.*\n' file It gives output:

This error
-this
-this
This error
-asd
-asfag
This error
-asdgsda
-asdgg

So how does pcregrep actually works?