Multiline trimming

Question

I have a html file that I want to trim. I want to remove a section from the beginning all the way to a given string, and from another string to the end. How do I do that, preferably using sed?

Answer 1

With GNU sed:

sed '/mark1/,/mark2/d;/mark3/,$d'

this

abc
def
mark1
ghi
jkl
mno
mark2
pqr
stu
mark3
vwx
yz

becomes

abc
def
pqr
stu