on *:text:*:#chan1:{
if (http iswm $1-) || (www iswm $1-) { .msg #chan2 $1- }
}
I think that should do what you're asking for. I accept no responsibility for usage of this code on channels that don't allow URL advertising.
Replace #chan1 with the name of the channel you want to monitor and #chan2 with the name of the channel you want the information sent to
