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create code fences with backticks ` or tildes ~
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like so
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sed -e 's/version=\(.+\)/\1/' input.txtthis will still output the whole input.txt\+instead of+. And I dont understand why people use-efor just one sed command.sed -e -n 's/version=\(.+\)/\1/p' input.txtsee: mikeplate.com/2012/05/09/…sed -Eto use the so-called "modern" or "extended" regular expressions that look a lot closer to Perl/Java/JavaScript/Go/whatever flavors. (Compare togrep -Eoregrep.) The default syntax has those strange escaping rules and is considered "obsolete". For more info on the differences between the two, runman 7 re_format.