cat posts/2010-07-21-regular-expression-to-check-for-primes.md
Regular Expression to check for primes
// archive Originally published on my old blog, indiangeek.net, in 2010. Links and opinions may have aged.
perl -wle 'print "Prime" if (1 x shift) !~ /^1?$|^(11+?)\1+$/' [number]
via montreal.pm.org
This is a nice trick to check if a number is prime using regular expressions, I am going to try and see how this performs compared to regular methods and see if anything interesting comes up.