olegalexandrov writes: "Kiva Systems of Woburn, Mass., sells robots that retrieve items to be shipped from a warehouse, doubling the productivity and speeding up order processing. The ottoman-shaped robots are used in warehouses run by Staples, Walgreen and Gap.com. The bots communicate wirelessly with servers sending directions and navigate using cameras to read barcode stickers on the warehouse floor."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals