excluding first and last lines from sed /START/,/END/

Question

Consider the input:

=sec1=
some-line
some-other-line

foo
bar=baz

=sec2=
c=baz

If I wish to process only =sec1= I can for example comment

Answer 1

I've used:

sed '/begin/,/end/{/begin\|end/!p}'

This will search all the lines between the patterns, then print everything not containing the patterns