Losing leading 0s when string converts to array

I hav开发者_如何学运维e a textInput control that sends .txt value to an array collection. The array collection is a collection of US zip codes so I use a regular expression to ensure I only get digits from the textInput.

private function addSingle(stringLoader:ArrayCollection):ArrayCollection {
  arrayString += (txtSingle.text) + '';
  var re:RegExp = /\D/;
  var newArray:Array = arrayString.split(re);

The US zip codes start at 00501. Following the debugger, after the zip is submitted, the variable 'arrayString' is 00501. But once 'newArray' is assigned a vaule, it removes the first two 0s and leaves me with 501. Is this my regular expression doing something I'm not expecting? Could it be the array changing the value? I wrote a regexp test in javascript.

<script type="text/javascript">
  var str="00501"; 
  var patt1=/\D/;
  document.write(str.match(patt1));
</script>

and i get null, which leads me to believe the regexp Im using is fine. In the help docs on the split method, I dont see any reference to leading 0s being a problem.

**I have removed the regular expression from my code completely and the same problem is still happening. Which means it is not the regular expression where the problem is coming from.

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Running this simplified case:

var arrayString:String = '00501';
var re:RegExp = /\D/;
var newArray:Array = arrayString.split(re);
trace(newArray);

Yields '00501' as expected. There's nothing in the code you've posted that would strip leading zeros. You may want to dig around a bit more.

This smells suspiciously like Number coercion: Number('00501') yields 501. Read through the docs for implicit conversions and check if any pop up in your code.

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What about this ?

/^\d+$/

You can also specify exactly 5 numbers like this :

/^\d{5}$/

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I recommend just getting the zip codes instead of splitting on non-digits (especially if 'arrayString' might have multiple zip codes):

var newArray:Array = [];
var pattern:RegExp = /(\d+)/g;
var zipObject:Object;

while ((zipObject = pattern.exec(arrayString)) != null)
{
    newArray.push(zipObject[1]);
}

for (var i:int = 0; i < newArray.length; i++)
{
    trace("zip code " + i + " is: " + newArray[i]);
}