Be sure that user input is number or number array ex: '2,4,6,1'

numberInputArray.js

// Be sure that user input is number or number array ex: '2,4,6,1'
// Demo: 
// http://jsfiddle.net/ED2Ra/6/
// http://codepen.io/Knovour/pen/fFJxi

var keyRegex = /[\d,]$/;
var numberArrayReg = /^((0$|0,)|[1-9]\d*,?)*$/;  // (0$|0,) : prevent 00 or 0[1-9]

$('input[type=text]') 
  .keypress(function(event) {
    var key = String.fromCharCode(event.which);
    if(!keyRegex.test(key) || (!$(this).val() && key === ',')) // If input value is emtpy, can't input ','
      return false;
  }).on('keyup paste', function(event) {
    var value = $(this).val();
    if(!numberArrayReg.test(value)) {
      value = value
        .replace(/,{2,}/i,   ',')            // remove multi ',' sign
        .replace(/^,+/i,     '')             // remove ',' sign at start, ex: ',1,2,3'
        .replace(/[^\d,]/ig, '')             // remove not number char & ',' sign
        .replace(/(^|,)0+(\d+)/ig, "$1$2");  // remove multi zero, ex: '001,003' => '1,3';

      $(this).val(value);
    }
  });