The other way around :)
Mac CR \015 \x0D \r
DOS CRLF \015\012 \x0D\x0A \r\n
*Nix LF \012 \x0A \n
(Assuming \r is chr(13) and \n is chr(10), which isn't always true)
The regex to substitute them all would be
s/\cM|\cM\cJ|\cJ/$foo/, which can be simplified to
s/\cM\cJ?|\cJ/$foo/. But if you don't need to substitute, removing can be done a lot faster by just using
tr/\cM\cJ//d (the /d will have tr/// delete characters not found in the replacement pattern (the replacenent pattern is empty in this example)).
2;0 juerd@ouranos:~$ perl -e'undef christmas'
Segmentation fault
2;139 juerd@ouranos:~$
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