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| | craftofcoding.wordpress.com
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| | It's very easy to check a decimal number is divisible by three using a simple DFA with 3 states. A regex, therefor, is possible, but not too pretty (source): Example: http://www.rubular.com/r/ZcRDblHg8M Here's another approach, using .Net's stacks as a simple counter: Why? Well, I was bored while I shaved. Luckily, this regex is simple enough...
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| | A Compendium of Cool Internet Math Things
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