jfruh writes: "Dan Tynan is a privacy blogger and longtime proponent of the use of browser plug-ins and other technologies that block advertisers from tracking you web browsing habits. He's also a professional tech writer who makes his living writing articles for free, ad-supported sites. But he doesn't feel those two facts are in conflict, and points out that users pay good money to ISPs for those "free" sites."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals