/http:\S*[^\w\s]/g and s/\G\n//;

##</code><code>##

/http:\S*[^\w\s]/g and s/\G\n// and $http=1;
$http and /^\S*[\w\s]/g and s/\G\n// or $http=0;

##</code><code>##

Check out
http://homestarrunner.com/sbemail/
and let me know what you think