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This is what I’m doing (simplified example):
gsed -i -E 's/^(?!foo)(.*)$/bar\1/' file.txt
I’m trying to put bar in front of every line that doesn’t start with foo. This is the error:
gsed: -e expression #1, char 22: Invalid preceding regular expression
What’s wrong?
As far as I know
sedhas not neither look-ahead nor look-behind. Switch to a more powerful language with similar syntax, likeperl.