ForgedArtificer writes "At their recent developers conference in San Diego, CA, PayPal unveiled a proof-of-concept gumball machine that would instantly pay for a gumball through a PayPal account using a smart phone and a QR code, sending a confirmation of the purchase through Twitter. Ok, maybe we all don't really care if we can get a gumball without a quarter, but the possibilities for this technology are endless."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals