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A comment on Make grep 50x faster.

Re:Make grep 50x faster by tszming on Sunday December 15, 2013 @12:29PM (#6910056)
See:

[1] https://news.ycombinator.com/item?id=3337411

[2] http://dtrace.org/blogs/brendan/2011/12/08/2000x-performance...

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Re:Make grep 50x faster by acqq on Sunday December 15, 2013 @03:17PM (#6910664)
And especially:

http://rg03.wordpress.com/2009/09/09/gnu-grep-is-slow-on-utf...

"Update on 2010/10/28: GNU grep is no longer slow on UTF-8. The problem was fixed with the release of GNU grep 2.7. The rest of the article can now be considered obsolete."

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