pie multiline replace

[email protected] (bill lam)
Newsgroups perl.beginners
Message-ID <[email protected]> 
Hello,
Sorry this must be a faq but I cannot find any answer in google.

Suppose I want to change 2 lines to 3 line in files as follow using perl -p -i 
-e command
aa
bb

aa
cc
bb

this doesn't work
perl -p -i -e "s/aa\nbb/aa\ncc\nbb/g;" foo.txt

what is the correct command (I use linux).

Thanks in advance,
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