Ok, we'll go with your solution. Include the urls:
http://www.google.com/search?q=PerlREand
http://www.google.com/search?q=PCREOr do we have to worry about
google getting bought out by AOL and/or changing ?q to something else?
Honestly, I don't think it's our position to worry about users complaining if an url no longer exists. You're making the assumption that it's GOING to happen, and that the complaints will outweigh the number of people who have been enlightened by the information rather than just giving up early on.