Sorting AlphaNumeric Strings in Javascript

sortAlphaNum.js

/* Straight copy from https://stackoverflow.com/questions/4340227/sort-mixed-alpha-numeric-array */

/* Note that the ^ in [^xyz] creates a negated character set, and does not match the beginning of the line. */ 
var reA = /[^a-zA-Z]/g;
var reN = /[^0-9]/g;
function sortAlphaNum(a,b) {
    var aA = a.replace(reA, "");
    var bA = b.replace(reA, "");
    if(aA === bA) {
        var aN = parseInt(a.replace(reN, ""), 10);
        var bN = parseInt(b.replace(reN, ""), 10);
        return aN - bN;
    } else {
        return aA > bA ? 1 : -1;
    }
}

arr = ["A1", "A10", "A11", "A12", "A2", "A3", "A4", "B10", "B2", "F1", "F12", "F3"];
arr.sort(sortAlphaNum);