Those are good suggestions, but I would do this: 
s/(\r?\n){2,}/\n<\/p>\n<p>\n/g

[download]
to make the \r optional, instead of doing 2 passes over the data. (and I added a \n in the replacement to make the results look a little nicer in my eyes)
"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^2: regex to replace linefeeds with <p> tags by Joost
in thread regex to replace linefeeds with <p> tags by jck

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