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/hello/{found_hello=1;next} found_hello || /bar/{print;found_hello=""}

Success #stdin #stdout 0s 4388KB

stdin

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hello foo
needed
bar
blah
blah
bar
hello foo
needed
bar
blah
hello foo
needed
hello foo
needed
bar
blah

stdout

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needed
bar
bar
needed
bar
needed
needed
bar

https://ideone.com/EzCjLM

language:

AWK (gawk 4.2.1)

created:

visibility:

public

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