Regular Expression Mastery

Lookahead Assertions

     Received: from ni-s.u-net.com ([193.119.182.90] helo=bactrian.ni-s.u-net.com)
             by he101war.uk.vianw.net with esmtp (Exim 3.22 #5)
             id 17H8J0-0005po-00; Sun, 09 Jun 2002 20:24:51 +0100
     Content-Disposition: inline

Solution:

split /\n(?!\s)/

continued...