A regular expression to check for prime numbersNoulakaz The blog of Avinash, Christina, Anya and Kyan Meetoo. Regular expressions are extremely powerful. This is something I read at least once or twice every day while reading articles and blogs on the Web. While browsing today, I found this page which thoroughly describes the use of the regular expression /^1?$|^(11+?)\1+$/ in Perl to check if a number is prime or not!!! /^1?$|^(11+?)\1+$/ To
