Snipplr http://snipplr.com/language/regex/tags/prime Recent snippets posted on Snipplr.com en-us Mon, 20 May 2013 17:25:41 GMT (Regular Expression) Prime number tester - banzaiman http://snipplr.com/view/6713/prime-number-tester/ By the legendary abigail. Fails to match if and only if it is matched against a prime number of 1's. That is, '11' fails, but '1111' does not. I once heard him talk why this works, but I forgot most of it.

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