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    <p>I have to admit that regular expressions are not the first tool I would have thought of for doing this. I can pretty much guarantee that any RE capable of doing that to an unsorted hand is going to be far more hideous and far less readable than the equivalent procedural code.</p> <p>Assuming the cards are sorted by face value (and they seem to be otherwise your listed regexes wouldn't work either), and you <em>must</em> use a regex, you <em>could</em> use a construct like </p> <pre><code>2345A|23456|34567|...|9TJQK|TJQKA </code></pre> <p>to detect the face value part of the hand.</p> <p>In fact, from what I gather <a href="http://www.pokerstars.com/poker/games/rules/hand-rankings/" rel="nofollow noreferrer">here</a> of the "standard" hands, the following should be checked in order of decreasing priority:</p> <pre><code>Royal/straight flush: "(2345A|23456|34567|...|9TJQK|TJQKA)#(\\w)\\1{4}" Four of a kind: ".*(\\w)\\1{3}.*#.*" Full house: "((\\w)\\2\\2(\\w)\\3|(\\w)\\4(\\w)\\5\\5)#.*" Flush: ".*#(\\w)\\1{4}" Straight: "(2345A|23456|34567|...|9TJQK|TJQKA)#.*" Three of a kind: ".*(\\w)\\1\\1.*#.*" Two pair: ".*(\\w)\\1.*(\\w)\\2.*#.*" One pair: ".*(\\w)\\1.*#.*" High card: (none) </code></pre> <p>Basically, those are the same as yours except I've added the royal/straight flush and the straight. Provided you check them in order, you should get the best score from the hand. There's no regex for the high card since, at that point, it's the only score you can have.</p> <p>I also changed the steel wheel (wrap-around) straights from <code>A2345</code> to <code>2345A</code> since they'll be sorted that way.</p>
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    1. COAgreed. Run the regexes above, and then run procedural code to check for straights. That should be pretty straightforward - step through the string and make sure they're sequential.
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    2. CO@cincodenada: yes, that's how I'd do it. But sometimes, OPs have a good reason for doing it a specific way (e.g., they may be using a tool/framework that can only use regexes). So, while I'll suggest there may be a better way, I'll still try to help them out. I didn't gel to the idea at first but I can see it would make their source code small and elegant :-)
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    3. COTrue, which is why I commented on your answer and didn't make my own. But a good reminder to give the OP the benefit of the doubt regardless. Thanks :)
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