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seddoes.sed --in-place 's/expr/replacement/' /path/to/fileseddoesn't support multiline regex with such simple syntax and as far as I know it doesn't support lookahead or lookbehind at all.sed -e :a -e '$!{N;b a}' -e other_commands.... This way you can use multiline regexssed(super sed) supports perl regexperlitself cannot do this without some added programming logic dealing with the multiline regex which makes the syntax more complicated.