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A comment on Sculpting text with regex, grep, sed, awk, emacs and vim (2012).

Re:Sculpting text with regex, grep, sed, awk, emacs and vim ... by agumonkey on Tuesday July 29, 2014 @03:42AM (#8101110)
The composite (or prime) filter regexp is brilliant.

    $^(11+)(\1)+$
see OPs linked article http://zmievski.org/2010/08/the-prime-that-wasnt for details
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