> The regex '\r?\n' works on Windows and Unix line endings but I'm not sure
> about Mac.

That doesn't work on mac (which uses a single \r with no \n) the
simplest thing to do is 
[\r\n]+
which works everywhere so long as you don't mind losing blank lines.

if you do mind losing blank lines then replacing 

(\r\n?) by \n does the right thing I think.

> Not to mention IBM mainframes and other exotica.
yes if you want to be like xml 1.1 and support NEL need to replace
(\r\n?|͵) by \n

David

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