carmendrahl writes: "In Austria, people can submit their street drugs to a lab-on-a-bus to ensure they got what they paid for. The government is using the bus to track emergence of new variants of bath salts and other drugs. Now, researchers have developed a test they'd like to add to the bus's offerings: it assesses drug action instead of just reporting chemical structure."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals