How do I search and replace across multiple lines with Perl?

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You can use the -0 switch to change the input separator:

perl -0777pe 's/foo\nbar/FOO\nBAR/' baz.txt

-0777 sets the separator to undef, -0 alone sets it to \0 which might work for text files not containing the null byte.

Note that /m is needless as the regex does not contain ^ nor $.

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