from the a-little-help-here dept.
ZeroExistenZ writes "NASA plans to make another trip to Mars in 2018 for which they want to devise a plan by this summer. To come up with ideas for this mission, they turn to the public to tackle a few challenge areas. Participants must submit a brief abstract (no more than two pages) outlining the idea, and indicating in which of the topical areas the idea belongs. Abstracts are due no later than 5:00 p.m. U.S. Central Daylight Time May 10, 2012."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals