Question

In another question I learned how to calculate straight poker hand using regex (here).

Now, by curiosity, the question is: can I use regex to calculate the same thing, using ASCII CODE?

Something like:

regex: [C][C+1][C+2][C+3][C+4], being C the ASCII CODE (or like this)

Matches: 45678, 23456

Doesn’t matches: 45679 or 23459 (not in sequence)

Answer 1

SOLVED!

See in http://jsfiddle.net/g48K9/3

I solved using closure, in js.

String.prototype.isSequence = function () {
    If (this == "A2345") return true; // an exception
    return this.replace(/(\w)(\w)(\w)(\w)(\w)/, function (a, g1, g2, g3, g4, g5) {
        return    code(g1) == code(g2) -1 &&
                code(g2) == code(g3) -1 &&
                code(g3) == code(g4) -1 &&
                code(g4) == code(g5) -1;
    })
};

function code(card){
    switch(card){
        case "T": return 58;
        case "J": return 59;
        case "Q": return 60;
        case "K": return 61;
        case "A": return 62;
        default: return card.charCodeAt();
    }
}


test("23456");
test("23444");
test("789TJ");
test("TJQKA");
test("8JQKA");

function test(cards) {
    alert("cards " + cards + ": " + cards.isSequence())
}

---

Just to clarify, ascii codes:

ASCII CODES:

2 = 50
3 = 51
4 = 52
5 = 53
6 = 54
7 = 55
8 = 56
9 = 57
T = 84 -> 58
J = 74 -> 59
Q = 81 -> 60
K = 75 -> 61
A = 65 -> 62