blah

#!/usr/bin/env ruby

text = <<-EOL
foo
bar
Invoked...
hello
there!
Completed...
other
EOL

lines = text.split("\n")
new_lines = lines.select.with_index do |l, i|
  i > lines.index('Invoked...') && i < lines.index('Completed...')
end

p new_lines #=> ['hello', 'there!']