A Perl Regular Expression That Matches Prime Numbers (catonmat.net) - Dave's Blog
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A Perl Regular Expression That Matches Prime Numbers (catonmat.net)
2011 Dec 28, 3:36
perl -lne ‘(1x$_) =~ /^1?$|^(11+?)\1+$/ || print “$_ is prime”’
technical
perl
regexp
prime
math
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