Daniel_Stuckey writes "General Counsel of the Office of the Director of National Intelligence Robert S. Litt explained that our expectation of privacy isn't legally recognized by the Supreme Court once we've offered it to a third party. Thus, sifting through third party data doesn't qualify 'on a constitutional level' as invasive to our personal privacy. This he brought to an interesting point about volunteered personal data, and social media habits. Our willingness to give our information to companies and social networking websites is baffling to the ODNI. 'Why is it that people are willing to expose large quantities of information to private parties but don't want the Government to have the same information?,' he asked."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals