in reply to a cron; in perl
I was unaware of Schedule::Cron/Schedule::Cron and Set::Crontab/Set::Crontab for the first half of the development. In addition I attempted not to use any non-standard modules. I may consult these in the future, Set::Crontab looks promising for crontab(1).
-- perl -p -e "s/(?:\w);(<A HREF="/index.pl?node=st&lastnode_id=3333">st< +/A>)/'\$1/mg"