How to use python regular expression to substitute string value

[Allerdyce.John at gmail.com]

okay, but I have a simpler question, how can I split using only "\n"?

I try this:
            strings = node.data.split("\n");
             print node.data

             for str in strings:
                 print str

where node.data has multiple lines, but in the for loop, I don't see
str gets print out.