JS: Integer Range Validation

number.inrange.js

// regarding http://stackoverflow.com/questions/7887157/constructing-regular-expressions-to-match-numeric-ranges

function IntRangeTest(expression) {
  var tests = [];
  
  /*
    possible expressions:
        "*" - any integer
        "0,3-4" - 0 or between 3 and 4
        "0,-10--4" - 0 or between -10 and -4
        "0, -10 - -4" - 0 or between -10 and -4
        
    note: modifying this to allow negative values is up to you
  */
  
  if (expression == '*') {
      // only test for integer
  } else {
      // explode multiple tests
      var t = expression.split(',');
      for (var i=0, e; e = t[i]; i++) {
        // explode range
        var r = e.match(/\s*(-?\d+)\s*(-\s*(-?\d+))?\s*/);
        if (!r) {
            // did not match anything
        } else if (typeof r[3] == 'undefined') {
            // matched single number
            tests.push({
                equals: parseInt(r[1], 10)
            });
        } else {
            // matched range
            r[1] = parseInt(r[1], 10);
            r[3] = parseInt(r[3], 10);
            tests.push({
                lower: Math.min(r[1], r[3]),
                upper: Math.max(r[1], r[3])
            });
        }
      }
  }
  
  this.test = function(value) {
    if (typeof value != "number" && !(value+"").match(/^-?\d+$/)) {
      // not a number
      return false;
    }
    
    if (!tests.length) {
        return true;
    }
    
    value = parseInt(value, 10);

    for (var i=0, test; test = tests[i]; i++) {
        if (typeof test.equals == "number") {
            if (test.equals == value) {
                return true;
            }
        } else {
            if (value >= test.lower && value <= test.upper) {
                return true;
            }
        }
    }
    
    return false;
  };
}

var range;

range = new IntRangeTest('*');
console.log(
    "*", 
    range.test("") == false, 
    range.test("-5") == true, 
    range.test("0") == true, 
    range.test("5") == true, 
    range.test("11") == true, 
    range.test("123.23") == false
);

range = new IntRangeTest('0,10-20');
console.log(
    "0,10-20", 
    range.test("") == false, 
    range.test("-5") == false, 
    range.test("0") == true, 
    range.test("5") == false, 
    range.test("11") == true, 
    range.test("123.23") == false
);

range = new IntRangeTest('0, -10 - 20');
console.log(
    "0, -10 - 20", 
    range.test("") == false, 
    range.test("-5") == true, 
    range.test("0") == true, 
    range.test("5") == true, 
    range.test("11") == true, 
    range.test("123.23") == false
);

range = new IntRangeTest('0, -10 - -20');
console.log(
    "0, -10 - -20", 
    range.test("") == false, 
    range.test("-5") == false, 
    range.test("0") == true, 
    range.test("5") == false, 
    range.test("11") == false, 
    range.test("123.23") == false,
    range.test("-11") == true,
    range.test("-21") == false
);