kkleiner writes: "Mid-2012, Leap Motion unveiled the most accurate motion sensing technology on the market to date. The Leap detects every subtle finger flick and hand gesture with up to 1/100th of a millimeter precision. All that for just $70. A round of Minority Report and Prometheus references ensued—and then a round of skepticism. Now it appears the company is geared up for a major launch in 2013 with a large fleet of 3rd party app developers on its side."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals