Perl command line multi-line replace

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You are reading the file line-by-line, so only the first line matches your regex. What you’ll want to do — if you truly wish to delete most of the content — is to slurp the file by using the -0 option, e.g. -0777. This is line ending processing, and 777 is just a number used by convention as an octal number large enough so as to cause file slurping.

perl -0777 -i -pe 's/(\[mysqld\][^\^]+)/$1\nsometext/g' test.txt

Also, I replaced your quotes. If you are in *nix, which it seems you are, single quotes are preferable. Case in point, $1 would not be interpolated by the shell.

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